1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2018-2022 Intel Corporation
9 *
10 * Transmit and frame generation functions.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_vlan.h>
17 #include <linux/etherdevice.h>
18 #include <linux/bitmap.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <net/codel.h>
26 #include <net/codel_impl.h>
27 #include <asm/unaligned.h>
28 #include <net/fq_impl.h>
29
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
32 #include "led.h"
33 #include "mesh.h"
34 #include "wep.h"
35 #include "wpa.h"
36 #include "wme.h"
37 #include "rate.h"
38
39 /* misc utils */
40
ieee80211_duration(struct ieee80211_tx_data * tx,struct sk_buff * skb,int group_addr,int next_frag_len)41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
42 struct sk_buff *skb, int group_addr,
43 int next_frag_len)
44 {
45 int rate, mrate, erp, dur, i, shift = 0;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51 struct ieee80211_chanctx_conf *chanctx_conf;
52 u32 rate_flags = 0;
53
54 /* assume HW handles this */
55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
56 return 0;
57
58 rcu_read_lock();
59 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf);
60 if (chanctx_conf) {
61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
63 }
64 rcu_read_unlock();
65
66 /* uh huh? */
67 if (WARN_ON_ONCE(tx->rate.idx < 0))
68 return 0;
69
70 sband = local->hw.wiphy->bands[info->band];
71 txrate = &sband->bitrates[tx->rate.idx];
72
73 erp = txrate->flags & IEEE80211_RATE_ERP_G;
74
75 /* device is expected to do this */
76 if (sband->band == NL80211_BAND_S1GHZ)
77 return 0;
78
79 /*
80 * data and mgmt (except PS Poll):
81 * - during CFP: 32768
82 * - during contention period:
83 * if addr1 is group address: 0
84 * if more fragments = 0 and addr1 is individual address: time to
85 * transmit one ACK plus SIFS
86 * if more fragments = 1 and addr1 is individual address: time to
87 * transmit next fragment plus 2 x ACK plus 3 x SIFS
88 *
89 * IEEE 802.11, 9.6:
90 * - control response frame (CTS or ACK) shall be transmitted using the
91 * same rate as the immediately previous frame in the frame exchange
92 * sequence, if this rate belongs to the PHY mandatory rates, or else
93 * at the highest possible rate belonging to the PHY rates in the
94 * BSSBasicRateSet
95 */
96 hdr = (struct ieee80211_hdr *)skb->data;
97 if (ieee80211_is_ctl(hdr->frame_control)) {
98 /* TODO: These control frames are not currently sent by
99 * mac80211, but should they be implemented, this function
100 * needs to be updated to support duration field calculation.
101 *
102 * RTS: time needed to transmit pending data/mgmt frame plus
103 * one CTS frame plus one ACK frame plus 3 x SIFS
104 * CTS: duration of immediately previous RTS minus time
105 * required to transmit CTS and its SIFS
106 * ACK: 0 if immediately previous directed data/mgmt had
107 * more=0, with more=1 duration in ACK frame is duration
108 * from previous frame minus time needed to transmit ACK
109 * and its SIFS
110 * PS Poll: BIT(15) | BIT(14) | aid
111 */
112 return 0;
113 }
114
115 /* data/mgmt */
116 if (0 /* FIX: data/mgmt during CFP */)
117 return cpu_to_le16(32768);
118
119 if (group_addr) /* Group address as the destination - no ACK */
120 return 0;
121
122 /* Individual destination address:
123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
124 * CTS and ACK frames shall be transmitted using the highest rate in
125 * basic rate set that is less than or equal to the rate of the
126 * immediately previous frame and that is using the same modulation
127 * (CCK or OFDM). If no basic rate set matches with these requirements,
128 * the highest mandatory rate of the PHY that is less than or equal to
129 * the rate of the previous frame is used.
130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
131 */
132 rate = -1;
133 /* use lowest available if everything fails */
134 mrate = sband->bitrates[0].bitrate;
135 for (i = 0; i < sband->n_bitrates; i++) {
136 struct ieee80211_rate *r = &sband->bitrates[i];
137
138 if (r->bitrate > txrate->bitrate)
139 break;
140
141 if ((rate_flags & r->flags) != rate_flags)
142 continue;
143
144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
146
147 switch (sband->band) {
148 case NL80211_BAND_2GHZ:
149 case NL80211_BAND_LC: {
150 u32 flag;
151 if (tx->sdata->deflink.operating_11g_mode)
152 flag = IEEE80211_RATE_MANDATORY_G;
153 else
154 flag = IEEE80211_RATE_MANDATORY_B;
155 if (r->flags & flag)
156 mrate = r->bitrate;
157 break;
158 }
159 case NL80211_BAND_5GHZ:
160 case NL80211_BAND_6GHZ:
161 if (r->flags & IEEE80211_RATE_MANDATORY_A)
162 mrate = r->bitrate;
163 break;
164 case NL80211_BAND_S1GHZ:
165 case NL80211_BAND_60GHZ:
166 /* TODO, for now fall through */
167 case NUM_NL80211_BANDS:
168 WARN_ON(1);
169 break;
170 }
171 }
172 if (rate == -1) {
173 /* No matching basic rate found; use highest suitable mandatory
174 * PHY rate */
175 rate = DIV_ROUND_UP(mrate, 1 << shift);
176 }
177
178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
179 if (ieee80211_is_data_qos(hdr->frame_control) &&
180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
181 dur = 0;
182 else
183 /* Time needed to transmit ACK
184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
185 * to closest integer */
186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
187 tx->sdata->vif.bss_conf.use_short_preamble,
188 shift);
189
190 if (next_frag_len) {
191 /* Frame is fragmented: duration increases with time needed to
192 * transmit next fragment plus ACK and 2 x SIFS. */
193 dur *= 2; /* ACK + SIFS */
194 /* next fragment */
195 dur += ieee80211_frame_duration(sband->band, next_frag_len,
196 txrate->bitrate, erp,
197 tx->sdata->vif.bss_conf.use_short_preamble,
198 shift);
199 }
200
201 return cpu_to_le16(dur);
202 }
203
204 /* tx handlers */
205 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data * tx)206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
207 {
208 struct ieee80211_local *local = tx->local;
209 struct ieee80211_if_managed *ifmgd;
210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
211
212 /* driver doesn't support power save */
213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
214 return TX_CONTINUE;
215
216 /* hardware does dynamic power save */
217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
218 return TX_CONTINUE;
219
220 /* dynamic power save disabled */
221 if (local->hw.conf.dynamic_ps_timeout <= 0)
222 return TX_CONTINUE;
223
224 /* we are scanning, don't enable power save */
225 if (local->scanning)
226 return TX_CONTINUE;
227
228 if (!local->ps_sdata)
229 return TX_CONTINUE;
230
231 /* No point if we're going to suspend */
232 if (local->quiescing)
233 return TX_CONTINUE;
234
235 /* dynamic ps is supported only in managed mode */
236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
237 return TX_CONTINUE;
238
239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
240 return TX_CONTINUE;
241
242 ifmgd = &tx->sdata->u.mgd;
243
244 /*
245 * Don't wakeup from power save if u-apsd is enabled, voip ac has
246 * u-apsd enabled and the frame is in voip class. This effectively
247 * means that even if all access categories have u-apsd enabled, in
248 * practise u-apsd is only used with the voip ac. This is a
249 * workaround for the case when received voip class packets do not
250 * have correct qos tag for some reason, due the network or the
251 * peer application.
252 *
253 * Note: ifmgd->uapsd_queues access is racy here. If the value is
254 * changed via debugfs, user needs to reassociate manually to have
255 * everything in sync.
256 */
257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
260 return TX_CONTINUE;
261
262 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
263 ieee80211_stop_queues_by_reason(&local->hw,
264 IEEE80211_MAX_QUEUE_MAP,
265 IEEE80211_QUEUE_STOP_REASON_PS,
266 false);
267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
268 ieee80211_queue_work(&local->hw,
269 &local->dynamic_ps_disable_work);
270 }
271
272 /* Don't restart the timer if we're not disassociated */
273 if (!ifmgd->associated)
274 return TX_CONTINUE;
275
276 mod_timer(&local->dynamic_ps_timer, jiffies +
277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
278
279 return TX_CONTINUE;
280 }
281
282 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_assoc(struct ieee80211_tx_data * tx)283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
284 {
285
286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
288 bool assoc = false;
289
290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
291 return TX_CONTINUE;
292
293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
295 !ieee80211_is_probe_req(hdr->frame_control) &&
296 !ieee80211_is_any_nullfunc(hdr->frame_control))
297 /*
298 * When software scanning only nullfunc frames (to notify
299 * the sleep state to the AP) and probe requests (for the
300 * active scan) are allowed, all other frames should not be
301 * sent and we should not get here, but if we do
302 * nonetheless, drop them to avoid sending them
303 * off-channel. See the link below and
304 * ieee80211_start_scan() for more.
305 *
306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
307 */
308 return TX_DROP;
309
310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
311 return TX_CONTINUE;
312
313 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
314 return TX_CONTINUE;
315
316 if (tx->sta)
317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
318
319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
320 if (unlikely(!assoc &&
321 ieee80211_is_data(hdr->frame_control))) {
322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
323 sdata_info(tx->sdata,
324 "dropped data frame to not associated station %pM\n",
325 hdr->addr1);
326 #endif
327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
328 return TX_DROP;
329 }
330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
332 /*
333 * No associated STAs - no need to send multicast
334 * frames.
335 */
336 return TX_DROP;
337 }
338
339 return TX_CONTINUE;
340 }
341
342 /* This function is called whenever the AP is about to exceed the maximum limit
343 * of buffered frames for power saving STAs. This situation should not really
344 * happen often during normal operation, so dropping the oldest buffered packet
345 * from each queue should be OK to make some room for new frames. */
purge_old_ps_buffers(struct ieee80211_local * local)346 static void purge_old_ps_buffers(struct ieee80211_local *local)
347 {
348 int total = 0, purged = 0;
349 struct sk_buff *skb;
350 struct ieee80211_sub_if_data *sdata;
351 struct sta_info *sta;
352
353 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
354 struct ps_data *ps;
355
356 if (sdata->vif.type == NL80211_IFTYPE_AP)
357 ps = &sdata->u.ap.ps;
358 else if (ieee80211_vif_is_mesh(&sdata->vif))
359 ps = &sdata->u.mesh.ps;
360 else
361 continue;
362
363 skb = skb_dequeue(&ps->bc_buf);
364 if (skb) {
365 purged++;
366 ieee80211_free_txskb(&local->hw, skb);
367 }
368 total += skb_queue_len(&ps->bc_buf);
369 }
370
371 /*
372 * Drop one frame from each station from the lowest-priority
373 * AC that has frames at all.
374 */
375 list_for_each_entry_rcu(sta, &local->sta_list, list) {
376 int ac;
377
378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
379 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
380 total += skb_queue_len(&sta->ps_tx_buf[ac]);
381 if (skb) {
382 purged++;
383 ieee80211_free_txskb(&local->hw, skb);
384 break;
385 }
386 }
387 }
388
389 local->total_ps_buffered = total;
390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
391 }
392
393 static ieee80211_tx_result
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data * tx)394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
395 {
396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
398 struct ps_data *ps;
399
400 /*
401 * broadcast/multicast frame
402 *
403 * If any of the associated/peer stations is in power save mode,
404 * the frame is buffered to be sent after DTIM beacon frame.
405 * This is done either by the hardware or us.
406 */
407
408 /* powersaving STAs currently only in AP/VLAN/mesh mode */
409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
411 if (!tx->sdata->bss)
412 return TX_CONTINUE;
413
414 ps = &tx->sdata->bss->ps;
415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
416 ps = &tx->sdata->u.mesh.ps;
417 } else {
418 return TX_CONTINUE;
419 }
420
421
422 /* no buffering for ordered frames */
423 if (ieee80211_has_order(hdr->frame_control))
424 return TX_CONTINUE;
425
426 if (ieee80211_is_probe_req(hdr->frame_control))
427 return TX_CONTINUE;
428
429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
430 info->hw_queue = tx->sdata->vif.cab_queue;
431
432 /* no stations in PS mode and no buffered packets */
433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
434 return TX_CONTINUE;
435
436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
437
438 /* device releases frame after DTIM beacon */
439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
440 return TX_CONTINUE;
441
442 /* buffered in mac80211 */
443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
444 purge_old_ps_buffers(tx->local);
445
446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
447 ps_dbg(tx->sdata,
448 "BC TX buffer full - dropping the oldest frame\n");
449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
450 } else
451 tx->local->total_ps_buffered++;
452
453 skb_queue_tail(&ps->bc_buf, tx->skb);
454
455 return TX_QUEUED;
456 }
457
ieee80211_use_mfp(__le16 fc,struct sta_info * sta,struct sk_buff * skb)458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
459 struct sk_buff *skb)
460 {
461 if (!ieee80211_is_mgmt(fc))
462 return 0;
463
464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
465 return 0;
466
467 if (!ieee80211_is_robust_mgmt_frame(skb))
468 return 0;
469
470 return 1;
471 }
472
473 static ieee80211_tx_result
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data * tx)474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
475 {
476 struct sta_info *sta = tx->sta;
477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
479 struct ieee80211_local *local = tx->local;
480
481 if (unlikely(!sta))
482 return TX_CONTINUE;
483
484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
488 int ac = skb_get_queue_mapping(tx->skb);
489
490 if (ieee80211_is_mgmt(hdr->frame_control) &&
491 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
493 return TX_CONTINUE;
494 }
495
496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
497 sta->sta.addr, sta->sta.aid, ac);
498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
499 purge_old_ps_buffers(tx->local);
500
501 /* sync with ieee80211_sta_ps_deliver_wakeup */
502 spin_lock(&sta->ps_lock);
503 /*
504 * STA woke up the meantime and all the frames on ps_tx_buf have
505 * been queued to pending queue. No reordering can happen, go
506 * ahead and Tx the packet.
507 */
508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
511 spin_unlock(&sta->ps_lock);
512 return TX_CONTINUE;
513 }
514
515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
517 ps_dbg(tx->sdata,
518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
519 sta->sta.addr, ac);
520 ieee80211_free_txskb(&local->hw, old);
521 } else
522 tx->local->total_ps_buffered++;
523
524 info->control.jiffies = jiffies;
525 info->control.vif = &tx->sdata->vif;
526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
529 spin_unlock(&sta->ps_lock);
530
531 if (!timer_pending(&local->sta_cleanup))
532 mod_timer(&local->sta_cleanup,
533 round_jiffies(jiffies +
534 STA_INFO_CLEANUP_INTERVAL));
535
536 /*
537 * We queued up some frames, so the TIM bit might
538 * need to be set, recalculate it.
539 */
540 sta_info_recalc_tim(sta);
541
542 return TX_QUEUED;
543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
544 ps_dbg(tx->sdata,
545 "STA %pM in PS mode, but polling/in SP -> send frame\n",
546 sta->sta.addr);
547 }
548
549 return TX_CONTINUE;
550 }
551
552 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data * tx)553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
554 {
555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
556 return TX_CONTINUE;
557
558 if (tx->flags & IEEE80211_TX_UNICAST)
559 return ieee80211_tx_h_unicast_ps_buf(tx);
560 else
561 return ieee80211_tx_h_multicast_ps_buf(tx);
562 }
563
564 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data * tx)565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
566 {
567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
568
569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
570 if (tx->sdata->control_port_no_encrypt)
571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
574 }
575
576 return TX_CONTINUE;
577 }
578
579 static struct ieee80211_key *
ieee80211_select_link_key(struct ieee80211_tx_data * tx)580 ieee80211_select_link_key(struct ieee80211_tx_data *tx)
581 {
582 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
584 enum {
585 USE_NONE,
586 USE_MGMT_KEY,
587 USE_MCAST_KEY,
588 } which_key = USE_NONE;
589 struct ieee80211_link_data *link;
590 unsigned int link_id;
591
592 if (ieee80211_is_group_privacy_action(tx->skb))
593 which_key = USE_MCAST_KEY;
594 else if (ieee80211_is_mgmt(hdr->frame_control) &&
595 is_multicast_ether_addr(hdr->addr1) &&
596 ieee80211_is_robust_mgmt_frame(tx->skb))
597 which_key = USE_MGMT_KEY;
598 else if (is_multicast_ether_addr(hdr->addr1))
599 which_key = USE_MCAST_KEY;
600 else
601 return NULL;
602
603 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK);
604 if (link_id == IEEE80211_LINK_UNSPECIFIED) {
605 link = &tx->sdata->deflink;
606 } else {
607 link = rcu_dereference(tx->sdata->link[link_id]);
608 if (!link)
609 return NULL;
610 }
611
612 switch (which_key) {
613 case USE_NONE:
614 break;
615 case USE_MGMT_KEY:
616 return rcu_dereference(link->default_mgmt_key);
617 case USE_MCAST_KEY:
618 return rcu_dereference(link->default_multicast_key);
619 }
620
621 return NULL;
622 }
623
624 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_select_key(struct ieee80211_tx_data * tx)625 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
626 {
627 struct ieee80211_key *key;
628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
630
631 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
632 tx->key = NULL;
633 return TX_CONTINUE;
634 }
635
636 if (tx->sta &&
637 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
638 tx->key = key;
639 else if ((key = ieee80211_select_link_key(tx)))
640 tx->key = key;
641 else if (!is_multicast_ether_addr(hdr->addr1) &&
642 (key = rcu_dereference(tx->sdata->default_unicast_key)))
643 tx->key = key;
644 else
645 tx->key = NULL;
646
647 if (tx->key) {
648 bool skip_hw = false;
649
650 /* TODO: add threshold stuff again */
651
652 switch (tx->key->conf.cipher) {
653 case WLAN_CIPHER_SUITE_WEP40:
654 case WLAN_CIPHER_SUITE_WEP104:
655 case WLAN_CIPHER_SUITE_TKIP:
656 if (!ieee80211_is_data_present(hdr->frame_control))
657 tx->key = NULL;
658 break;
659 case WLAN_CIPHER_SUITE_CCMP:
660 case WLAN_CIPHER_SUITE_CCMP_256:
661 case WLAN_CIPHER_SUITE_GCMP:
662 case WLAN_CIPHER_SUITE_GCMP_256:
663 if (!ieee80211_is_data_present(hdr->frame_control) &&
664 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
665 tx->skb) &&
666 !ieee80211_is_group_privacy_action(tx->skb))
667 tx->key = NULL;
668 else
669 skip_hw = (tx->key->conf.flags &
670 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
671 ieee80211_is_mgmt(hdr->frame_control);
672 break;
673 case WLAN_CIPHER_SUITE_AES_CMAC:
674 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
675 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
676 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
677 if (!ieee80211_is_mgmt(hdr->frame_control))
678 tx->key = NULL;
679 break;
680 }
681
682 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
683 !ieee80211_is_deauth(hdr->frame_control)))
684 return TX_DROP;
685
686 if (!skip_hw && tx->key &&
687 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
688 info->control.hw_key = &tx->key->conf;
689 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
690 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
691 return TX_DROP;
692 }
693
694 return TX_CONTINUE;
695 }
696
697 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data * tx)698 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
699 {
700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
701 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
702 struct ieee80211_supported_band *sband;
703 u32 len;
704 struct ieee80211_tx_rate_control txrc;
705 struct ieee80211_sta_rates *ratetbl = NULL;
706 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
707 bool assoc = false;
708
709 memset(&txrc, 0, sizeof(txrc));
710
711 sband = tx->local->hw.wiphy->bands[info->band];
712
713 len = min_t(u32, tx->skb->len + FCS_LEN,
714 tx->local->hw.wiphy->frag_threshold);
715
716 /* set up the tx rate control struct we give the RC algo */
717 txrc.hw = &tx->local->hw;
718 txrc.sband = sband;
719 txrc.bss_conf = &tx->sdata->vif.bss_conf;
720 txrc.skb = tx->skb;
721 txrc.reported_rate.idx = -1;
722 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
723
724 if (tx->sdata->rc_has_mcs_mask[info->band])
725 txrc.rate_idx_mcs_mask =
726 tx->sdata->rc_rateidx_mcs_mask[info->band];
727
728 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
729 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
730 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
731 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
732
733 /* set up RTS protection if desired */
734 if (len > tx->local->hw.wiphy->rts_threshold) {
735 txrc.rts = true;
736 }
737
738 info->control.use_rts = txrc.rts;
739 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
740
741 /*
742 * Use short preamble if the BSS can handle it, but not for
743 * management frames unless we know the receiver can handle
744 * that -- the management frame might be to a station that
745 * just wants a probe response.
746 */
747 if (tx->sdata->vif.bss_conf.use_short_preamble &&
748 (ieee80211_is_tx_data(tx->skb) ||
749 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
750 txrc.short_preamble = true;
751
752 info->control.short_preamble = txrc.short_preamble;
753
754 /* don't ask rate control when rate already injected via radiotap */
755 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
756 return TX_CONTINUE;
757
758 if (tx->sta)
759 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
760
761 /*
762 * Lets not bother rate control if we're associated and cannot
763 * talk to the sta. This should not happen.
764 */
765 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
766 !rate_usable_index_exists(sband, &tx->sta->sta),
767 "%s: Dropped data frame as no usable bitrate found while "
768 "scanning and associated. Target station: "
769 "%pM on %d GHz band\n",
770 tx->sdata->name,
771 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
772 info->band ? 5 : 2))
773 return TX_DROP;
774
775 /*
776 * If we're associated with the sta at this point we know we can at
777 * least send the frame at the lowest bit rate.
778 */
779 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
780
781 if (tx->sta && !info->control.skip_table)
782 ratetbl = rcu_dereference(tx->sta->sta.rates);
783
784 if (unlikely(info->control.rates[0].idx < 0)) {
785 if (ratetbl) {
786 struct ieee80211_tx_rate rate = {
787 .idx = ratetbl->rate[0].idx,
788 .flags = ratetbl->rate[0].flags,
789 .count = ratetbl->rate[0].count
790 };
791
792 if (ratetbl->rate[0].idx < 0)
793 return TX_DROP;
794
795 tx->rate = rate;
796 } else {
797 return TX_DROP;
798 }
799 } else {
800 tx->rate = info->control.rates[0];
801 }
802
803 if (txrc.reported_rate.idx < 0) {
804 txrc.reported_rate = tx->rate;
805 if (tx->sta && ieee80211_is_tx_data(tx->skb))
806 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
807 } else if (tx->sta)
808 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
809
810 if (ratetbl)
811 return TX_CONTINUE;
812
813 if (unlikely(!info->control.rates[0].count))
814 info->control.rates[0].count = 1;
815
816 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
817 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
818 info->control.rates[0].count = 1;
819
820 return TX_CONTINUE;
821 }
822
ieee80211_tx_next_seq(struct sta_info * sta,int tid)823 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
824 {
825 u16 *seq = &sta->tid_seq[tid];
826 __le16 ret = cpu_to_le16(*seq);
827
828 /* Increase the sequence number. */
829 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
830
831 return ret;
832 }
833
834 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data * tx)835 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
836 {
837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
838 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
839 int tid;
840
841 /*
842 * Packet injection may want to control the sequence
843 * number, if we have no matching interface then we
844 * neither assign one ourselves nor ask the driver to.
845 */
846 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
847 return TX_CONTINUE;
848
849 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
850 return TX_CONTINUE;
851
852 if (ieee80211_hdrlen(hdr->frame_control) < 24)
853 return TX_CONTINUE;
854
855 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
856 return TX_CONTINUE;
857
858 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
859 return TX_CONTINUE;
860
861 /* SNS11 from 802.11be 10.3.2.14 */
862 if (unlikely(is_multicast_ether_addr(hdr->addr1) &&
863 info->control.vif->valid_links &&
864 info->control.vif->type == NL80211_IFTYPE_AP)) {
865 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX)
866 tx->sdata->mld_mcast_seq += 0x10;
867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq);
868 return TX_CONTINUE;
869 }
870
871 /*
872 * Anything but QoS data that has a sequence number field
873 * (is long enough) gets a sequence number from the global
874 * counter. QoS data frames with a multicast destination
875 * also use the global counter (802.11-2012 9.3.2.10).
876 */
877 if (!ieee80211_is_data_qos(hdr->frame_control) ||
878 is_multicast_ether_addr(hdr->addr1)) {
879 /* driver should assign sequence number */
880 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
881 /* for pure STA mode without beacons, we can do it */
882 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
883 tx->sdata->sequence_number += 0x10;
884 if (tx->sta)
885 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
886 return TX_CONTINUE;
887 }
888
889 /*
890 * This should be true for injected/management frames only, for
891 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
892 * above since they are not QoS-data frames.
893 */
894 if (!tx->sta)
895 return TX_CONTINUE;
896
897 /* include per-STA, per-TID sequence counter */
898 tid = ieee80211_get_tid(hdr);
899 tx->sta->deflink.tx_stats.msdu[tid]++;
900
901 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
902
903 return TX_CONTINUE;
904 }
905
ieee80211_fragment(struct ieee80211_tx_data * tx,struct sk_buff * skb,int hdrlen,int frag_threshold)906 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
907 struct sk_buff *skb, int hdrlen,
908 int frag_threshold)
909 {
910 struct ieee80211_local *local = tx->local;
911 struct ieee80211_tx_info *info;
912 struct sk_buff *tmp;
913 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
914 int pos = hdrlen + per_fragm;
915 int rem = skb->len - hdrlen - per_fragm;
916
917 if (WARN_ON(rem < 0))
918 return -EINVAL;
919
920 /* first fragment was already added to queue by caller */
921
922 while (rem) {
923 int fraglen = per_fragm;
924
925 if (fraglen > rem)
926 fraglen = rem;
927 rem -= fraglen;
928 tmp = dev_alloc_skb(local->tx_headroom +
929 frag_threshold +
930 IEEE80211_ENCRYPT_HEADROOM +
931 IEEE80211_ENCRYPT_TAILROOM);
932 if (!tmp)
933 return -ENOMEM;
934
935 __skb_queue_tail(&tx->skbs, tmp);
936
937 skb_reserve(tmp,
938 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
939
940 /* copy control information */
941 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
942
943 info = IEEE80211_SKB_CB(tmp);
944 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
945 IEEE80211_TX_CTL_FIRST_FRAGMENT);
946
947 if (rem)
948 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
949
950 skb_copy_queue_mapping(tmp, skb);
951 tmp->priority = skb->priority;
952 tmp->dev = skb->dev;
953
954 /* copy header and data */
955 skb_put_data(tmp, skb->data, hdrlen);
956 skb_put_data(tmp, skb->data + pos, fraglen);
957
958 pos += fraglen;
959 }
960
961 /* adjust first fragment's length */
962 skb_trim(skb, hdrlen + per_fragm);
963 return 0;
964 }
965
966 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_fragment(struct ieee80211_tx_data * tx)967 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
968 {
969 struct sk_buff *skb = tx->skb;
970 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
971 struct ieee80211_hdr *hdr = (void *)skb->data;
972 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
973 int hdrlen;
974 int fragnum;
975
976 /* no matter what happens, tx->skb moves to tx->skbs */
977 __skb_queue_tail(&tx->skbs, skb);
978 tx->skb = NULL;
979
980 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
981 return TX_CONTINUE;
982
983 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
984 return TX_CONTINUE;
985
986 /*
987 * Warn when submitting a fragmented A-MPDU frame and drop it.
988 * This scenario is handled in ieee80211_tx_prepare but extra
989 * caution taken here as fragmented ampdu may cause Tx stop.
990 */
991 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
992 return TX_DROP;
993
994 hdrlen = ieee80211_hdrlen(hdr->frame_control);
995
996 /* internal error, why isn't DONTFRAG set? */
997 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
998 return TX_DROP;
999
1000 /*
1001 * Now fragment the frame. This will allocate all the fragments and
1002 * chain them (using skb as the first fragment) to skb->next.
1003 * During transmission, we will remove the successfully transmitted
1004 * fragments from this list. When the low-level driver rejects one
1005 * of the fragments then we will simply pretend to accept the skb
1006 * but store it away as pending.
1007 */
1008 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
1009 return TX_DROP;
1010
1011 /* update duration/seq/flags of fragments */
1012 fragnum = 0;
1013
1014 skb_queue_walk(&tx->skbs, skb) {
1015 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
1016
1017 hdr = (void *)skb->data;
1018 info = IEEE80211_SKB_CB(skb);
1019
1020 if (!skb_queue_is_last(&tx->skbs, skb)) {
1021 hdr->frame_control |= morefrags;
1022 /*
1023 * No multi-rate retries for fragmented frames, that
1024 * would completely throw off the NAV at other STAs.
1025 */
1026 info->control.rates[1].idx = -1;
1027 info->control.rates[2].idx = -1;
1028 info->control.rates[3].idx = -1;
1029 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
1030 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1031 } else {
1032 hdr->frame_control &= ~morefrags;
1033 }
1034 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1035 fragnum++;
1036 }
1037
1038 return TX_CONTINUE;
1039 }
1040
1041 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data * tx)1042 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1043 {
1044 struct sk_buff *skb;
1045 int ac = -1;
1046
1047 if (!tx->sta)
1048 return TX_CONTINUE;
1049
1050 skb_queue_walk(&tx->skbs, skb) {
1051 ac = skb_get_queue_mapping(skb);
1052 tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
1053 }
1054 if (ac >= 0)
1055 tx->sta->deflink.tx_stats.packets[ac]++;
1056
1057 return TX_CONTINUE;
1058 }
1059
1060 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_encrypt(struct ieee80211_tx_data * tx)1061 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1062 {
1063 if (!tx->key)
1064 return TX_CONTINUE;
1065
1066 switch (tx->key->conf.cipher) {
1067 case WLAN_CIPHER_SUITE_WEP40:
1068 case WLAN_CIPHER_SUITE_WEP104:
1069 return ieee80211_crypto_wep_encrypt(tx);
1070 case WLAN_CIPHER_SUITE_TKIP:
1071 return ieee80211_crypto_tkip_encrypt(tx);
1072 case WLAN_CIPHER_SUITE_CCMP:
1073 return ieee80211_crypto_ccmp_encrypt(
1074 tx, IEEE80211_CCMP_MIC_LEN);
1075 case WLAN_CIPHER_SUITE_CCMP_256:
1076 return ieee80211_crypto_ccmp_encrypt(
1077 tx, IEEE80211_CCMP_256_MIC_LEN);
1078 case WLAN_CIPHER_SUITE_AES_CMAC:
1079 return ieee80211_crypto_aes_cmac_encrypt(tx);
1080 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1081 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1082 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1083 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1084 return ieee80211_crypto_aes_gmac_encrypt(tx);
1085 case WLAN_CIPHER_SUITE_GCMP:
1086 case WLAN_CIPHER_SUITE_GCMP_256:
1087 return ieee80211_crypto_gcmp_encrypt(tx);
1088 }
1089
1090 return TX_DROP;
1091 }
1092
1093 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data * tx)1094 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1095 {
1096 struct sk_buff *skb;
1097 struct ieee80211_hdr *hdr;
1098 int next_len;
1099 bool group_addr;
1100
1101 skb_queue_walk(&tx->skbs, skb) {
1102 hdr = (void *) skb->data;
1103 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1104 break; /* must not overwrite AID */
1105 if (!skb_queue_is_last(&tx->skbs, skb)) {
1106 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1107 next_len = next->len;
1108 } else
1109 next_len = 0;
1110 group_addr = is_multicast_ether_addr(hdr->addr1);
1111
1112 hdr->duration_id =
1113 ieee80211_duration(tx, skb, group_addr, next_len);
1114 }
1115
1116 return TX_CONTINUE;
1117 }
1118
1119 /* actual transmit path */
1120
ieee80211_tx_prep_agg(struct ieee80211_tx_data * tx,struct sk_buff * skb,struct ieee80211_tx_info * info,struct tid_ampdu_tx * tid_tx,int tid)1121 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1122 struct sk_buff *skb,
1123 struct ieee80211_tx_info *info,
1124 struct tid_ampdu_tx *tid_tx,
1125 int tid)
1126 {
1127 bool queued = false;
1128 bool reset_agg_timer = false;
1129 struct sk_buff *purge_skb = NULL;
1130
1131 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1132 info->flags |= IEEE80211_TX_CTL_AMPDU;
1133 reset_agg_timer = true;
1134 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1135 /*
1136 * nothing -- this aggregation session is being started
1137 * but that might still fail with the driver
1138 */
1139 } else if (!tx->sta->sta.txq[tid]) {
1140 spin_lock(&tx->sta->lock);
1141 /*
1142 * Need to re-check now, because we may get here
1143 *
1144 * 1) in the window during which the setup is actually
1145 * already done, but not marked yet because not all
1146 * packets are spliced over to the driver pending
1147 * queue yet -- if this happened we acquire the lock
1148 * either before or after the splice happens, but
1149 * need to recheck which of these cases happened.
1150 *
1151 * 2) during session teardown, if the OPERATIONAL bit
1152 * was cleared due to the teardown but the pointer
1153 * hasn't been assigned NULL yet (or we loaded it
1154 * before it was assigned) -- in this case it may
1155 * now be NULL which means we should just let the
1156 * packet pass through because splicing the frames
1157 * back is already done.
1158 */
1159 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1160
1161 if (!tid_tx) {
1162 /* do nothing, let packet pass through */
1163 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1164 info->flags |= IEEE80211_TX_CTL_AMPDU;
1165 reset_agg_timer = true;
1166 } else {
1167 queued = true;
1168 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1169 clear_sta_flag(tx->sta, WLAN_STA_SP);
1170 ps_dbg(tx->sta->sdata,
1171 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1172 tx->sta->sta.addr, tx->sta->sta.aid);
1173 }
1174 info->control.vif = &tx->sdata->vif;
1175 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1176 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1177 __skb_queue_tail(&tid_tx->pending, skb);
1178 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1179 purge_skb = __skb_dequeue(&tid_tx->pending);
1180 }
1181 spin_unlock(&tx->sta->lock);
1182
1183 if (purge_skb)
1184 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1185 }
1186
1187 /* reset session timer */
1188 if (reset_agg_timer)
1189 tid_tx->last_tx = jiffies;
1190
1191 return queued;
1192 }
1193
1194 static void
ieee80211_aggr_check(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1195 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
1196 struct sta_info *sta,
1197 struct sk_buff *skb)
1198 {
1199 struct rate_control_ref *ref = sdata->local->rate_ctrl;
1200 u16 tid;
1201
1202 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
1203 return;
1204
1205 if (!sta || !sta->sta.deflink.ht_cap.ht_supported ||
1206 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
1207 skb->protocol == sdata->control_port_protocol)
1208 return;
1209
1210 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1211 if (likely(sta->ampdu_mlme.tid_tx[tid]))
1212 return;
1213
1214 ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
1215 }
1216
1217 /*
1218 * initialises @tx
1219 * pass %NULL for the station if unknown, a valid pointer if known
1220 * or an ERR_PTR() if the station is known not to exist
1221 */
1222 static ieee80211_tx_result
ieee80211_tx_prepare(struct ieee80211_sub_if_data * sdata,struct ieee80211_tx_data * tx,struct sta_info * sta,struct sk_buff * skb)1223 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1224 struct ieee80211_tx_data *tx,
1225 struct sta_info *sta, struct sk_buff *skb)
1226 {
1227 struct ieee80211_local *local = sdata->local;
1228 struct ieee80211_hdr *hdr;
1229 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1230 bool aggr_check = false;
1231 int tid;
1232
1233 memset(tx, 0, sizeof(*tx));
1234 tx->skb = skb;
1235 tx->local = local;
1236 tx->sdata = sdata;
1237 __skb_queue_head_init(&tx->skbs);
1238
1239 /*
1240 * If this flag is set to true anywhere, and we get here,
1241 * we are doing the needed processing, so remove the flag
1242 * now.
1243 */
1244 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1245
1246 hdr = (struct ieee80211_hdr *) skb->data;
1247
1248 if (likely(sta)) {
1249 if (!IS_ERR(sta))
1250 tx->sta = sta;
1251 } else {
1252 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1253 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1254 if (!tx->sta && sdata->wdev.use_4addr)
1255 return TX_DROP;
1256 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
1257 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1258 }
1259 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
1260 tx->sta = sta_info_get(sdata, hdr->addr1);
1261 aggr_check = true;
1262 }
1263 }
1264
1265 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1266 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1267 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1268 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1269 struct tid_ampdu_tx *tid_tx;
1270
1271 tid = ieee80211_get_tid(hdr);
1272 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1273 if (!tid_tx && aggr_check) {
1274 ieee80211_aggr_check(sdata, tx->sta, skb);
1275 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1276 }
1277
1278 if (tid_tx) {
1279 bool queued;
1280
1281 queued = ieee80211_tx_prep_agg(tx, skb, info,
1282 tid_tx, tid);
1283
1284 if (unlikely(queued))
1285 return TX_QUEUED;
1286 }
1287 }
1288
1289 if (is_multicast_ether_addr(hdr->addr1)) {
1290 tx->flags &= ~IEEE80211_TX_UNICAST;
1291 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1292 } else
1293 tx->flags |= IEEE80211_TX_UNICAST;
1294
1295 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1296 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1297 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1298 (info->flags & IEEE80211_TX_CTL_AMPDU &&
1299 !local->ops->wake_tx_queue))
1300 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1301 }
1302
1303 if (!tx->sta)
1304 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1305 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1306 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1307 ieee80211_check_fast_xmit(tx->sta);
1308 }
1309
1310 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1311
1312 return TX_CONTINUE;
1313 }
1314
ieee80211_get_txq(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff * skb)1315 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1316 struct ieee80211_vif *vif,
1317 struct sta_info *sta,
1318 struct sk_buff *skb)
1319 {
1320 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1321 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1322 struct ieee80211_txq *txq = NULL;
1323
1324 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1325 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1326 return NULL;
1327
1328 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
1329 unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1330 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1331 ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1332 vif->type == NL80211_IFTYPE_STATION) &&
1333 sta && sta->uploaded) {
1334 /*
1335 * This will be NULL if the driver didn't set the
1336 * opt-in hardware flag.
1337 */
1338 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1339 }
1340 } else if (sta) {
1341 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1342
1343 if (!sta->uploaded)
1344 return NULL;
1345
1346 txq = sta->sta.txq[tid];
1347 } else if (vif) {
1348 txq = vif->txq;
1349 }
1350
1351 if (!txq)
1352 return NULL;
1353
1354 return to_txq_info(txq);
1355 }
1356
ieee80211_set_skb_enqueue_time(struct sk_buff * skb)1357 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1358 {
1359 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1360 }
1361
codel_skb_len_func(const struct sk_buff * skb)1362 static u32 codel_skb_len_func(const struct sk_buff *skb)
1363 {
1364 return skb->len;
1365 }
1366
codel_skb_time_func(const struct sk_buff * skb)1367 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1368 {
1369 const struct ieee80211_tx_info *info;
1370
1371 info = (const struct ieee80211_tx_info *)skb->cb;
1372 return info->control.enqueue_time;
1373 }
1374
codel_dequeue_func(struct codel_vars * cvars,void * ctx)1375 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1376 void *ctx)
1377 {
1378 struct ieee80211_local *local;
1379 struct txq_info *txqi;
1380 struct fq *fq;
1381 struct fq_flow *flow;
1382
1383 txqi = ctx;
1384 local = vif_to_sdata(txqi->txq.vif)->local;
1385 fq = &local->fq;
1386
1387 if (cvars == &txqi->def_cvars)
1388 flow = &txqi->tin.default_flow;
1389 else
1390 flow = &fq->flows[cvars - local->cvars];
1391
1392 return fq_flow_dequeue(fq, flow);
1393 }
1394
codel_drop_func(struct sk_buff * skb,void * ctx)1395 static void codel_drop_func(struct sk_buff *skb,
1396 void *ctx)
1397 {
1398 struct ieee80211_local *local;
1399 struct ieee80211_hw *hw;
1400 struct txq_info *txqi;
1401
1402 txqi = ctx;
1403 local = vif_to_sdata(txqi->txq.vif)->local;
1404 hw = &local->hw;
1405
1406 ieee80211_free_txskb(hw, skb);
1407 }
1408
fq_tin_dequeue_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow)1409 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1410 struct fq_tin *tin,
1411 struct fq_flow *flow)
1412 {
1413 struct ieee80211_local *local;
1414 struct txq_info *txqi;
1415 struct codel_vars *cvars;
1416 struct codel_params *cparams;
1417 struct codel_stats *cstats;
1418
1419 local = container_of(fq, struct ieee80211_local, fq);
1420 txqi = container_of(tin, struct txq_info, tin);
1421 cstats = &txqi->cstats;
1422
1423 if (txqi->txq.sta) {
1424 struct sta_info *sta = container_of(txqi->txq.sta,
1425 struct sta_info, sta);
1426 cparams = &sta->cparams;
1427 } else {
1428 cparams = &local->cparams;
1429 }
1430
1431 if (flow == &tin->default_flow)
1432 cvars = &txqi->def_cvars;
1433 else
1434 cvars = &local->cvars[flow - fq->flows];
1435
1436 return codel_dequeue(txqi,
1437 &flow->backlog,
1438 cparams,
1439 cvars,
1440 cstats,
1441 codel_skb_len_func,
1442 codel_skb_time_func,
1443 codel_drop_func,
1444 codel_dequeue_func);
1445 }
1446
fq_skb_free_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb)1447 static void fq_skb_free_func(struct fq *fq,
1448 struct fq_tin *tin,
1449 struct fq_flow *flow,
1450 struct sk_buff *skb)
1451 {
1452 struct ieee80211_local *local;
1453
1454 local = container_of(fq, struct ieee80211_local, fq);
1455 ieee80211_free_txskb(&local->hw, skb);
1456 }
1457
ieee80211_txq_enqueue(struct ieee80211_local * local,struct txq_info * txqi,struct sk_buff * skb)1458 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1459 struct txq_info *txqi,
1460 struct sk_buff *skb)
1461 {
1462 struct fq *fq = &local->fq;
1463 struct fq_tin *tin = &txqi->tin;
1464 u32 flow_idx = fq_flow_idx(fq, skb);
1465
1466 ieee80211_set_skb_enqueue_time(skb);
1467
1468 spin_lock_bh(&fq->lock);
1469 /*
1470 * For management frames, don't really apply codel etc.,
1471 * we don't want to apply any shaping or anything we just
1472 * want to simplify the driver API by having them on the
1473 * txqi.
1474 */
1475 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
1476 IEEE80211_SKB_CB(skb)->control.flags |=
1477 IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1478 __skb_queue_tail(&txqi->frags, skb);
1479 } else {
1480 fq_tin_enqueue(fq, tin, flow_idx, skb,
1481 fq_skb_free_func);
1482 }
1483 spin_unlock_bh(&fq->lock);
1484 }
1485
fq_vlan_filter_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb,void * data)1486 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1487 struct fq_flow *flow, struct sk_buff *skb,
1488 void *data)
1489 {
1490 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1491
1492 return info->control.vif == data;
1493 }
1494
ieee80211_txq_remove_vlan(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1495 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1496 struct ieee80211_sub_if_data *sdata)
1497 {
1498 struct fq *fq = &local->fq;
1499 struct txq_info *txqi;
1500 struct fq_tin *tin;
1501 struct ieee80211_sub_if_data *ap;
1502
1503 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1504 return;
1505
1506 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1507
1508 if (!ap->vif.txq)
1509 return;
1510
1511 txqi = to_txq_info(ap->vif.txq);
1512 tin = &txqi->tin;
1513
1514 spin_lock_bh(&fq->lock);
1515 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1516 fq_skb_free_func);
1517 spin_unlock_bh(&fq->lock);
1518 }
1519
ieee80211_txq_init(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct txq_info * txqi,int tid)1520 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1521 struct sta_info *sta,
1522 struct txq_info *txqi, int tid)
1523 {
1524 fq_tin_init(&txqi->tin);
1525 codel_vars_init(&txqi->def_cvars);
1526 codel_stats_init(&txqi->cstats);
1527 __skb_queue_head_init(&txqi->frags);
1528 INIT_LIST_HEAD(&txqi->schedule_order);
1529
1530 txqi->txq.vif = &sdata->vif;
1531
1532 if (!sta) {
1533 sdata->vif.txq = &txqi->txq;
1534 txqi->txq.tid = 0;
1535 txqi->txq.ac = IEEE80211_AC_BE;
1536
1537 return;
1538 }
1539
1540 if (tid == IEEE80211_NUM_TIDS) {
1541 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1542 /* Drivers need to opt in to the management MPDU TXQ */
1543 if (!ieee80211_hw_check(&sdata->local->hw,
1544 STA_MMPDU_TXQ))
1545 return;
1546 } else if (!ieee80211_hw_check(&sdata->local->hw,
1547 BUFF_MMPDU_TXQ)) {
1548 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1549 return;
1550 }
1551 txqi->txq.ac = IEEE80211_AC_VO;
1552 } else {
1553 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1554 }
1555
1556 txqi->txq.sta = &sta->sta;
1557 txqi->txq.tid = tid;
1558 sta->sta.txq[tid] = &txqi->txq;
1559 }
1560
ieee80211_txq_purge(struct ieee80211_local * local,struct txq_info * txqi)1561 void ieee80211_txq_purge(struct ieee80211_local *local,
1562 struct txq_info *txqi)
1563 {
1564 struct fq *fq = &local->fq;
1565 struct fq_tin *tin = &txqi->tin;
1566
1567 spin_lock_bh(&fq->lock);
1568 fq_tin_reset(fq, tin, fq_skb_free_func);
1569 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1570 spin_unlock_bh(&fq->lock);
1571
1572 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1573 list_del_init(&txqi->schedule_order);
1574 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1575 }
1576
ieee80211_txq_set_params(struct ieee80211_local * local)1577 void ieee80211_txq_set_params(struct ieee80211_local *local)
1578 {
1579 if (local->hw.wiphy->txq_limit)
1580 local->fq.limit = local->hw.wiphy->txq_limit;
1581 else
1582 local->hw.wiphy->txq_limit = local->fq.limit;
1583
1584 if (local->hw.wiphy->txq_memory_limit)
1585 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1586 else
1587 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1588
1589 if (local->hw.wiphy->txq_quantum)
1590 local->fq.quantum = local->hw.wiphy->txq_quantum;
1591 else
1592 local->hw.wiphy->txq_quantum = local->fq.quantum;
1593 }
1594
ieee80211_txq_setup_flows(struct ieee80211_local * local)1595 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1596 {
1597 struct fq *fq = &local->fq;
1598 int ret;
1599 int i;
1600 bool supp_vht = false;
1601 enum nl80211_band band;
1602
1603 if (!local->ops->wake_tx_queue)
1604 return 0;
1605
1606 ret = fq_init(fq, 4096);
1607 if (ret)
1608 return ret;
1609
1610 /*
1611 * If the hardware doesn't support VHT, it is safe to limit the maximum
1612 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1613 */
1614 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1615 struct ieee80211_supported_band *sband;
1616
1617 sband = local->hw.wiphy->bands[band];
1618 if (!sband)
1619 continue;
1620
1621 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1622 }
1623
1624 if (!supp_vht)
1625 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1626
1627 codel_params_init(&local->cparams);
1628 local->cparams.interval = MS2TIME(100);
1629 local->cparams.target = MS2TIME(20);
1630 local->cparams.ecn = true;
1631
1632 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1633 GFP_KERNEL);
1634 if (!local->cvars) {
1635 spin_lock_bh(&fq->lock);
1636 fq_reset(fq, fq_skb_free_func);
1637 spin_unlock_bh(&fq->lock);
1638 return -ENOMEM;
1639 }
1640
1641 for (i = 0; i < fq->flows_cnt; i++)
1642 codel_vars_init(&local->cvars[i]);
1643
1644 ieee80211_txq_set_params(local);
1645
1646 return 0;
1647 }
1648
ieee80211_txq_teardown_flows(struct ieee80211_local * local)1649 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1650 {
1651 struct fq *fq = &local->fq;
1652
1653 if (!local->ops->wake_tx_queue)
1654 return;
1655
1656 kfree(local->cvars);
1657 local->cvars = NULL;
1658
1659 spin_lock_bh(&fq->lock);
1660 fq_reset(fq, fq_skb_free_func);
1661 spin_unlock_bh(&fq->lock);
1662 }
1663
ieee80211_queue_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1664 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1665 struct ieee80211_sub_if_data *sdata,
1666 struct sta_info *sta,
1667 struct sk_buff *skb)
1668 {
1669 struct ieee80211_vif *vif;
1670 struct txq_info *txqi;
1671
1672 if (!local->ops->wake_tx_queue ||
1673 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1674 return false;
1675
1676 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1677 sdata = container_of(sdata->bss,
1678 struct ieee80211_sub_if_data, u.ap);
1679
1680 vif = &sdata->vif;
1681 txqi = ieee80211_get_txq(local, vif, sta, skb);
1682
1683 if (!txqi)
1684 return false;
1685
1686 ieee80211_txq_enqueue(local, txqi, skb);
1687
1688 schedule_and_wake_txq(local, txqi);
1689
1690 return true;
1691 }
1692
ieee80211_tx_frags(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff_head * skbs,bool txpending)1693 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1694 struct ieee80211_vif *vif,
1695 struct sta_info *sta,
1696 struct sk_buff_head *skbs,
1697 bool txpending)
1698 {
1699 struct ieee80211_tx_control control = {};
1700 struct sk_buff *skb, *tmp;
1701 unsigned long flags;
1702
1703 skb_queue_walk_safe(skbs, skb, tmp) {
1704 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1705 int q = info->hw_queue;
1706
1707 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1708 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1709 __skb_unlink(skb, skbs);
1710 ieee80211_free_txskb(&local->hw, skb);
1711 continue;
1712 }
1713 #endif
1714
1715 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1716 if (local->queue_stop_reasons[q] ||
1717 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1718 if (unlikely(info->flags &
1719 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1720 if (local->queue_stop_reasons[q] &
1721 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1722 /*
1723 * Drop off-channel frames if queues
1724 * are stopped for any reason other
1725 * than off-channel operation. Never
1726 * queue them.
1727 */
1728 spin_unlock_irqrestore(
1729 &local->queue_stop_reason_lock,
1730 flags);
1731 ieee80211_purge_tx_queue(&local->hw,
1732 skbs);
1733 return true;
1734 }
1735 } else {
1736
1737 /*
1738 * Since queue is stopped, queue up frames for
1739 * later transmission from the tx-pending
1740 * tasklet when the queue is woken again.
1741 */
1742 if (txpending)
1743 skb_queue_splice_init(skbs,
1744 &local->pending[q]);
1745 else
1746 skb_queue_splice_tail_init(skbs,
1747 &local->pending[q]);
1748
1749 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1750 flags);
1751 return false;
1752 }
1753 }
1754 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1755
1756 info->control.vif = vif;
1757 control.sta = sta ? &sta->sta : NULL;
1758
1759 __skb_unlink(skb, skbs);
1760 drv_tx(local, &control, skb);
1761 }
1762
1763 return true;
1764 }
1765
1766 /*
1767 * Returns false if the frame couldn't be transmitted but was queued instead.
1768 */
__ieee80211_tx(struct ieee80211_local * local,struct sk_buff_head * skbs,struct sta_info * sta,bool txpending)1769 static bool __ieee80211_tx(struct ieee80211_local *local,
1770 struct sk_buff_head *skbs, struct sta_info *sta,
1771 bool txpending)
1772 {
1773 struct ieee80211_tx_info *info;
1774 struct ieee80211_sub_if_data *sdata;
1775 struct ieee80211_vif *vif;
1776 struct sk_buff *skb;
1777 bool result;
1778
1779 if (WARN_ON(skb_queue_empty(skbs)))
1780 return true;
1781
1782 skb = skb_peek(skbs);
1783 info = IEEE80211_SKB_CB(skb);
1784 sdata = vif_to_sdata(info->control.vif);
1785 if (sta && !sta->uploaded)
1786 sta = NULL;
1787
1788 switch (sdata->vif.type) {
1789 case NL80211_IFTYPE_MONITOR:
1790 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1791 vif = &sdata->vif;
1792 break;
1793 }
1794 sdata = rcu_dereference(local->monitor_sdata);
1795 if (sdata) {
1796 vif = &sdata->vif;
1797 info->hw_queue =
1798 vif->hw_queue[skb_get_queue_mapping(skb)];
1799 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1800 ieee80211_purge_tx_queue(&local->hw, skbs);
1801 return true;
1802 } else
1803 vif = NULL;
1804 break;
1805 case NL80211_IFTYPE_AP_VLAN:
1806 sdata = container_of(sdata->bss,
1807 struct ieee80211_sub_if_data, u.ap);
1808 fallthrough;
1809 default:
1810 vif = &sdata->vif;
1811 break;
1812 }
1813
1814 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1815
1816 WARN_ON_ONCE(!skb_queue_empty(skbs));
1817
1818 return result;
1819 }
1820
1821 /*
1822 * Invoke TX handlers, return 0 on success and non-zero if the
1823 * frame was dropped or queued.
1824 *
1825 * The handlers are split into an early and late part. The latter is everything
1826 * that can be sensitive to reordering, and will be deferred to after packets
1827 * are dequeued from the intermediate queues (when they are enabled).
1828 */
invoke_tx_handlers_early(struct ieee80211_tx_data * tx)1829 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1830 {
1831 ieee80211_tx_result res = TX_DROP;
1832
1833 #define CALL_TXH(txh) \
1834 do { \
1835 res = txh(tx); \
1836 if (res != TX_CONTINUE) \
1837 goto txh_done; \
1838 } while (0)
1839
1840 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1841 CALL_TXH(ieee80211_tx_h_check_assoc);
1842 CALL_TXH(ieee80211_tx_h_ps_buf);
1843 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1844 CALL_TXH(ieee80211_tx_h_select_key);
1845
1846 txh_done:
1847 if (unlikely(res == TX_DROP)) {
1848 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1849 if (tx->skb)
1850 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1851 else
1852 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1853 return -1;
1854 } else if (unlikely(res == TX_QUEUED)) {
1855 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1856 return -1;
1857 }
1858
1859 return 0;
1860 }
1861
1862 /*
1863 * Late handlers can be called while the sta lock is held. Handlers that can
1864 * cause packets to be generated will cause deadlock!
1865 */
invoke_tx_handlers_late(struct ieee80211_tx_data * tx)1866 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1867 {
1868 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1869 ieee80211_tx_result res = TX_CONTINUE;
1870
1871 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1872 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1873
1874 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1875 __skb_queue_tail(&tx->skbs, tx->skb);
1876 tx->skb = NULL;
1877 goto txh_done;
1878 }
1879
1880 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1881 CALL_TXH(ieee80211_tx_h_sequence);
1882 CALL_TXH(ieee80211_tx_h_fragment);
1883 /* handlers after fragment must be aware of tx info fragmentation! */
1884 CALL_TXH(ieee80211_tx_h_stats);
1885 CALL_TXH(ieee80211_tx_h_encrypt);
1886 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1887 CALL_TXH(ieee80211_tx_h_calculate_duration);
1888 #undef CALL_TXH
1889
1890 txh_done:
1891 if (unlikely(res == TX_DROP)) {
1892 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1893 if (tx->skb)
1894 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1895 else
1896 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1897 return -1;
1898 } else if (unlikely(res == TX_QUEUED)) {
1899 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1900 return -1;
1901 }
1902
1903 return 0;
1904 }
1905
invoke_tx_handlers(struct ieee80211_tx_data * tx)1906 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1907 {
1908 int r = invoke_tx_handlers_early(tx);
1909
1910 if (r)
1911 return r;
1912 return invoke_tx_handlers_late(tx);
1913 }
1914
ieee80211_tx_prepare_skb(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct sk_buff * skb,int band,struct ieee80211_sta ** sta)1915 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1916 struct ieee80211_vif *vif, struct sk_buff *skb,
1917 int band, struct ieee80211_sta **sta)
1918 {
1919 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1920 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1921 struct ieee80211_tx_data tx;
1922 struct sk_buff *skb2;
1923
1924 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1925 return false;
1926
1927 info->band = band;
1928 info->control.vif = vif;
1929 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1930
1931 if (invoke_tx_handlers(&tx))
1932 return false;
1933
1934 if (sta) {
1935 if (tx.sta)
1936 *sta = &tx.sta->sta;
1937 else
1938 *sta = NULL;
1939 }
1940
1941 /* this function isn't suitable for fragmented data frames */
1942 skb2 = __skb_dequeue(&tx.skbs);
1943 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1944 ieee80211_free_txskb(hw, skb2);
1945 ieee80211_purge_tx_queue(hw, &tx.skbs);
1946 return false;
1947 }
1948
1949 return true;
1950 }
1951 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1952
1953 /*
1954 * Returns false if the frame couldn't be transmitted but was queued instead.
1955 */
ieee80211_tx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb,bool txpending)1956 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1957 struct sta_info *sta, struct sk_buff *skb,
1958 bool txpending)
1959 {
1960 struct ieee80211_local *local = sdata->local;
1961 struct ieee80211_tx_data tx;
1962 ieee80211_tx_result res_prepare;
1963 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1964 bool result = true;
1965
1966 if (unlikely(skb->len < 10)) {
1967 dev_kfree_skb(skb);
1968 return true;
1969 }
1970
1971 /* initialises tx */
1972 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1973
1974 if (unlikely(res_prepare == TX_DROP)) {
1975 ieee80211_free_txskb(&local->hw, skb);
1976 return true;
1977 } else if (unlikely(res_prepare == TX_QUEUED)) {
1978 return true;
1979 }
1980
1981 /* set up hw_queue value early */
1982 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1983 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1984 info->hw_queue =
1985 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1986
1987 if (invoke_tx_handlers_early(&tx))
1988 return true;
1989
1990 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1991 return true;
1992
1993 if (!invoke_tx_handlers_late(&tx))
1994 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending);
1995
1996 return result;
1997 }
1998
1999 /* device xmit handlers */
2000
2001 enum ieee80211_encrypt {
2002 ENCRYPT_NO,
2003 ENCRYPT_MGMT,
2004 ENCRYPT_DATA,
2005 };
2006
ieee80211_skb_resize(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int head_need,enum ieee80211_encrypt encrypt)2007 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
2008 struct sk_buff *skb,
2009 int head_need,
2010 enum ieee80211_encrypt encrypt)
2011 {
2012 struct ieee80211_local *local = sdata->local;
2013 bool enc_tailroom;
2014 int tail_need = 0;
2015
2016 enc_tailroom = encrypt == ENCRYPT_MGMT ||
2017 (encrypt == ENCRYPT_DATA &&
2018 sdata->crypto_tx_tailroom_needed_cnt);
2019
2020 if (enc_tailroom) {
2021 tail_need = IEEE80211_ENCRYPT_TAILROOM;
2022 tail_need -= skb_tailroom(skb);
2023 tail_need = max_t(int, tail_need, 0);
2024 }
2025
2026 if (skb_cloned(skb) &&
2027 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
2028 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
2029 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
2030 else if (head_need || tail_need)
2031 I802_DEBUG_INC(local->tx_expand_skb_head);
2032 else
2033 return 0;
2034
2035 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
2036 wiphy_debug(local->hw.wiphy,
2037 "failed to reallocate TX buffer\n");
2038 return -ENOMEM;
2039 }
2040
2041 return 0;
2042 }
2043
ieee80211_xmit(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)2044 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
2045 struct sta_info *sta, struct sk_buff *skb)
2046 {
2047 struct ieee80211_local *local = sdata->local;
2048 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2049 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2050 int headroom;
2051 enum ieee80211_encrypt encrypt;
2052
2053 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
2054 encrypt = ENCRYPT_NO;
2055 else if (ieee80211_is_mgmt(hdr->frame_control))
2056 encrypt = ENCRYPT_MGMT;
2057 else
2058 encrypt = ENCRYPT_DATA;
2059
2060 headroom = local->tx_headroom;
2061 if (encrypt != ENCRYPT_NO)
2062 headroom += IEEE80211_ENCRYPT_HEADROOM;
2063 headroom -= skb_headroom(skb);
2064 headroom = max_t(int, 0, headroom);
2065
2066 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
2067 ieee80211_free_txskb(&local->hw, skb);
2068 return;
2069 }
2070
2071 /* reload after potential resize */
2072 hdr = (struct ieee80211_hdr *) skb->data;
2073 info->control.vif = &sdata->vif;
2074
2075 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2076 if (ieee80211_is_data(hdr->frame_control) &&
2077 is_unicast_ether_addr(hdr->addr1)) {
2078 if (mesh_nexthop_resolve(sdata, skb))
2079 return; /* skb queued: don't free */
2080 } else {
2081 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2082 }
2083 }
2084
2085 ieee80211_set_qos_hdr(sdata, skb);
2086 ieee80211_tx(sdata, sta, skb, false);
2087 }
2088
ieee80211_validate_radiotap_len(struct sk_buff * skb)2089 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
2090 {
2091 struct ieee80211_radiotap_header *rthdr =
2092 (struct ieee80211_radiotap_header *)skb->data;
2093
2094 /* check for not even having the fixed radiotap header part */
2095 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2096 return false; /* too short to be possibly valid */
2097
2098 /* is it a header version we can trust to find length from? */
2099 if (unlikely(rthdr->it_version))
2100 return false; /* only version 0 is supported */
2101
2102 /* does the skb contain enough to deliver on the alleged length? */
2103 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data)))
2104 return false; /* skb too short for claimed rt header extent */
2105
2106 return true;
2107 }
2108
ieee80211_parse_tx_radiotap(struct sk_buff * skb,struct net_device * dev)2109 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
2110 struct net_device *dev)
2111 {
2112 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2113 struct ieee80211_radiotap_iterator iterator;
2114 struct ieee80211_radiotap_header *rthdr =
2115 (struct ieee80211_radiotap_header *) skb->data;
2116 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2117 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2118 NULL);
2119 u16 txflags;
2120 u16 rate = 0;
2121 bool rate_found = false;
2122 u8 rate_retries = 0;
2123 u16 rate_flags = 0;
2124 u8 mcs_known, mcs_flags, mcs_bw;
2125 u16 vht_known;
2126 u8 vht_mcs = 0, vht_nss = 0;
2127 int i;
2128
2129 if (!ieee80211_validate_radiotap_len(skb))
2130 return false;
2131
2132 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2133 IEEE80211_TX_CTL_DONTFRAG;
2134
2135 /*
2136 * for every radiotap entry that is present
2137 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2138 * entries present, or -EINVAL on error)
2139 */
2140
2141 while (!ret) {
2142 ret = ieee80211_radiotap_iterator_next(&iterator);
2143
2144 if (ret)
2145 continue;
2146
2147 /* see if this argument is something we can use */
2148 switch (iterator.this_arg_index) {
2149 /*
2150 * You must take care when dereferencing iterator.this_arg
2151 * for multibyte types... the pointer is not aligned. Use
2152 * get_unaligned((type *)iterator.this_arg) to dereference
2153 * iterator.this_arg for type "type" safely on all arches.
2154 */
2155 case IEEE80211_RADIOTAP_FLAGS:
2156 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2157 /*
2158 * this indicates that the skb we have been
2159 * handed has the 32-bit FCS CRC at the end...
2160 * we should react to that by snipping it off
2161 * because it will be recomputed and added
2162 * on transmission
2163 */
2164 if (skb->len < (iterator._max_length + FCS_LEN))
2165 return false;
2166
2167 skb_trim(skb, skb->len - FCS_LEN);
2168 }
2169 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2170 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2171 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2172 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2173 break;
2174
2175 case IEEE80211_RADIOTAP_TX_FLAGS:
2176 txflags = get_unaligned_le16(iterator.this_arg);
2177 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2178 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2179 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
2180 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
2181 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
2182 info->control.flags |=
2183 IEEE80211_TX_CTRL_DONT_REORDER;
2184 break;
2185
2186 case IEEE80211_RADIOTAP_RATE:
2187 rate = *iterator.this_arg;
2188 rate_flags = 0;
2189 rate_found = true;
2190 break;
2191
2192 case IEEE80211_RADIOTAP_DATA_RETRIES:
2193 rate_retries = *iterator.this_arg;
2194 break;
2195
2196 case IEEE80211_RADIOTAP_MCS:
2197 mcs_known = iterator.this_arg[0];
2198 mcs_flags = iterator.this_arg[1];
2199 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2200 break;
2201
2202 rate_found = true;
2203 rate = iterator.this_arg[2];
2204 rate_flags = IEEE80211_TX_RC_MCS;
2205
2206 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2207 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2208 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2209
2210 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2211 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2212 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2213 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2214
2215 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
2216 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
2217 info->flags |= IEEE80211_TX_CTL_LDPC;
2218
2219 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
2220 u8 stbc = u8_get_bits(mcs_flags,
2221 IEEE80211_RADIOTAP_MCS_STBC_MASK);
2222
2223 info->flags |=
2224 u32_encode_bits(stbc,
2225 IEEE80211_TX_CTL_STBC);
2226 }
2227 break;
2228
2229 case IEEE80211_RADIOTAP_VHT:
2230 vht_known = get_unaligned_le16(iterator.this_arg);
2231 rate_found = true;
2232
2233 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2234 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2235 (iterator.this_arg[2] &
2236 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2237 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2238 if (vht_known &
2239 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2240 if (iterator.this_arg[3] == 1)
2241 rate_flags |=
2242 IEEE80211_TX_RC_40_MHZ_WIDTH;
2243 else if (iterator.this_arg[3] == 4)
2244 rate_flags |=
2245 IEEE80211_TX_RC_80_MHZ_WIDTH;
2246 else if (iterator.this_arg[3] == 11)
2247 rate_flags |=
2248 IEEE80211_TX_RC_160_MHZ_WIDTH;
2249 }
2250
2251 vht_mcs = iterator.this_arg[4] >> 4;
2252 if (vht_mcs > 11)
2253 vht_mcs = 0;
2254 vht_nss = iterator.this_arg[4] & 0xF;
2255 if (!vht_nss || vht_nss > 8)
2256 vht_nss = 1;
2257 break;
2258
2259 /*
2260 * Please update the file
2261 * Documentation/networking/mac80211-injection.rst
2262 * when parsing new fields here.
2263 */
2264
2265 default:
2266 break;
2267 }
2268 }
2269
2270 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2271 return false;
2272
2273 if (rate_found) {
2274 struct ieee80211_supported_band *sband =
2275 local->hw.wiphy->bands[info->band];
2276
2277 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2278
2279 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2280 info->control.rates[i].idx = -1;
2281 info->control.rates[i].flags = 0;
2282 info->control.rates[i].count = 0;
2283 }
2284
2285 if (rate_flags & IEEE80211_TX_RC_MCS) {
2286 info->control.rates[0].idx = rate;
2287 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2288 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2289 vht_nss);
2290 } else if (sband) {
2291 for (i = 0; i < sband->n_bitrates; i++) {
2292 if (rate * 5 != sband->bitrates[i].bitrate)
2293 continue;
2294
2295 info->control.rates[0].idx = i;
2296 break;
2297 }
2298 }
2299
2300 if (info->control.rates[0].idx < 0)
2301 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2302
2303 info->control.rates[0].flags = rate_flags;
2304 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2305 local->hw.max_rate_tries);
2306 }
2307
2308 return true;
2309 }
2310
ieee80211_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)2311 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2312 struct net_device *dev)
2313 {
2314 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2315 struct ieee80211_chanctx_conf *chanctx_conf;
2316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2317 struct ieee80211_hdr *hdr;
2318 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2319 struct cfg80211_chan_def *chandef;
2320 u16 len_rthdr;
2321 int hdrlen;
2322
2323 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2324 if (unlikely(!ieee80211_sdata_running(sdata)))
2325 goto fail;
2326
2327 memset(info, 0, sizeof(*info));
2328 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2329 IEEE80211_TX_CTL_INJECTED;
2330
2331 /* Sanity-check the length of the radiotap header */
2332 if (!ieee80211_validate_radiotap_len(skb))
2333 goto fail;
2334
2335 /* we now know there is a radiotap header with a length we can use */
2336 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2337
2338 /*
2339 * fix up the pointers accounting for the radiotap
2340 * header still being in there. We are being given
2341 * a precooked IEEE80211 header so no need for
2342 * normal processing
2343 */
2344 skb_set_mac_header(skb, len_rthdr);
2345 /*
2346 * these are just fixed to the end of the rt area since we
2347 * don't have any better information and at this point, nobody cares
2348 */
2349 skb_set_network_header(skb, len_rthdr);
2350 skb_set_transport_header(skb, len_rthdr);
2351
2352 if (skb->len < len_rthdr + 2)
2353 goto fail;
2354
2355 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2356 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2357
2358 if (skb->len < len_rthdr + hdrlen)
2359 goto fail;
2360
2361 /*
2362 * Initialize skb->protocol if the injected frame is a data frame
2363 * carrying a rfc1042 header
2364 */
2365 if (ieee80211_is_data(hdr->frame_control) &&
2366 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2367 u8 *payload = (u8 *)hdr + hdrlen;
2368
2369 if (ether_addr_equal(payload, rfc1042_header))
2370 skb->protocol = cpu_to_be16((payload[6] << 8) |
2371 payload[7]);
2372 }
2373
2374 rcu_read_lock();
2375
2376 /*
2377 * We process outgoing injected frames that have a local address
2378 * we handle as though they are non-injected frames.
2379 * This code here isn't entirely correct, the local MAC address
2380 * isn't always enough to find the interface to use; for proper
2381 * VLAN support we have an nl80211-based mechanism.
2382 *
2383 * This is necessary, for example, for old hostapd versions that
2384 * don't use nl80211-based management TX/RX.
2385 */
2386 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2387 if (!ieee80211_sdata_running(tmp_sdata))
2388 continue;
2389 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2390 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2391 continue;
2392 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2393 sdata = tmp_sdata;
2394 break;
2395 }
2396 }
2397
2398 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2399 if (!chanctx_conf) {
2400 tmp_sdata = rcu_dereference(local->monitor_sdata);
2401 if (tmp_sdata)
2402 chanctx_conf =
2403 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
2404 }
2405
2406 if (chanctx_conf)
2407 chandef = &chanctx_conf->def;
2408 else if (!local->use_chanctx)
2409 chandef = &local->_oper_chandef;
2410 else
2411 goto fail_rcu;
2412
2413 /*
2414 * Frame injection is not allowed if beaconing is not allowed
2415 * or if we need radar detection. Beaconing is usually not allowed when
2416 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2417 * Passive scan is also used in world regulatory domains where
2418 * your country is not known and as such it should be treated as
2419 * NO TX unless the channel is explicitly allowed in which case
2420 * your current regulatory domain would not have the passive scan
2421 * flag.
2422 *
2423 * Since AP mode uses monitor interfaces to inject/TX management
2424 * frames we can make AP mode the exception to this rule once it
2425 * supports radar detection as its implementation can deal with
2426 * radar detection by itself. We can do that later by adding a
2427 * monitor flag interfaces used for AP support.
2428 */
2429 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2430 sdata->vif.type))
2431 goto fail_rcu;
2432
2433 info->band = chandef->chan->band;
2434
2435 /* Initialize skb->priority according to frame type and TID class,
2436 * with respect to the sub interface that the frame will actually
2437 * be transmitted on. If the DONT_REORDER flag is set, the original
2438 * skb-priority is preserved to assure frames injected with this
2439 * flag are not reordered relative to each other.
2440 */
2441 ieee80211_select_queue_80211(sdata, skb, hdr);
2442 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
2443
2444 /*
2445 * Process the radiotap header. This will now take into account the
2446 * selected chandef above to accurately set injection rates and
2447 * retransmissions.
2448 */
2449 if (!ieee80211_parse_tx_radiotap(skb, dev))
2450 goto fail_rcu;
2451
2452 /* remove the injection radiotap header */
2453 skb_pull(skb, len_rthdr);
2454
2455 ieee80211_xmit(sdata, NULL, skb);
2456 rcu_read_unlock();
2457
2458 return NETDEV_TX_OK;
2459
2460 fail_rcu:
2461 rcu_read_unlock();
2462 fail:
2463 dev_kfree_skb(skb);
2464 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2465 }
2466
ieee80211_is_tdls_setup(struct sk_buff * skb)2467 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2468 {
2469 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2470
2471 return ethertype == ETH_P_TDLS &&
2472 skb->len > 14 &&
2473 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2474 }
2475
ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info ** sta_out)2476 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2477 struct sk_buff *skb,
2478 struct sta_info **sta_out)
2479 {
2480 struct sta_info *sta;
2481
2482 switch (sdata->vif.type) {
2483 case NL80211_IFTYPE_AP_VLAN:
2484 sta = rcu_dereference(sdata->u.vlan.sta);
2485 if (sta) {
2486 *sta_out = sta;
2487 return 0;
2488 } else if (sdata->wdev.use_4addr) {
2489 return -ENOLINK;
2490 }
2491 fallthrough;
2492 case NL80211_IFTYPE_AP:
2493 case NL80211_IFTYPE_OCB:
2494 case NL80211_IFTYPE_ADHOC:
2495 if (is_multicast_ether_addr(skb->data)) {
2496 *sta_out = ERR_PTR(-ENOENT);
2497 return 0;
2498 }
2499 sta = sta_info_get_bss(sdata, skb->data);
2500 break;
2501 #ifdef CONFIG_MAC80211_MESH
2502 case NL80211_IFTYPE_MESH_POINT:
2503 /* determined much later */
2504 *sta_out = NULL;
2505 return 0;
2506 #endif
2507 case NL80211_IFTYPE_STATION:
2508 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2509 sta = sta_info_get(sdata, skb->data);
2510 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2511 if (test_sta_flag(sta,
2512 WLAN_STA_TDLS_PEER_AUTH)) {
2513 *sta_out = sta;
2514 return 0;
2515 }
2516
2517 /*
2518 * TDLS link during setup - throw out frames to
2519 * peer. Allow TDLS-setup frames to unauthorized
2520 * peers for the special case of a link teardown
2521 * after a TDLS sta is removed due to being
2522 * unreachable.
2523 */
2524 if (!ieee80211_is_tdls_setup(skb))
2525 return -EINVAL;
2526 }
2527
2528 }
2529
2530 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
2531 if (!sta)
2532 return -ENOLINK;
2533 break;
2534 default:
2535 return -EINVAL;
2536 }
2537
2538 *sta_out = sta ?: ERR_PTR(-ENOENT);
2539 return 0;
2540 }
2541
ieee80211_store_ack_skb(struct ieee80211_local * local,struct sk_buff * skb,u32 * info_flags,u64 * cookie)2542 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
2543 struct sk_buff *skb,
2544 u32 *info_flags,
2545 u64 *cookie)
2546 {
2547 struct sk_buff *ack_skb;
2548 u16 info_id = 0;
2549
2550 if (skb->sk)
2551 ack_skb = skb_clone_sk(skb);
2552 else
2553 ack_skb = skb_clone(skb, GFP_ATOMIC);
2554
2555 if (ack_skb) {
2556 unsigned long flags;
2557 int id;
2558
2559 spin_lock_irqsave(&local->ack_status_lock, flags);
2560 id = idr_alloc(&local->ack_status_frames, ack_skb,
2561 1, 0x2000, GFP_ATOMIC);
2562 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2563
2564 if (id >= 0) {
2565 info_id = id;
2566 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2567 if (cookie) {
2568 *cookie = ieee80211_mgmt_tx_cookie(local);
2569 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie;
2570 }
2571 } else {
2572 kfree_skb(ack_skb);
2573 }
2574 }
2575
2576 return info_id;
2577 }
2578
2579 /**
2580 * ieee80211_build_hdr - build 802.11 header in the given frame
2581 * @sdata: virtual interface to build the header for
2582 * @skb: the skb to build the header in
2583 * @info_flags: skb flags to set
2584 * @sta: the station pointer
2585 * @ctrl_flags: info control flags to set
2586 * @cookie: cookie pointer to fill (if not %NULL)
2587 *
2588 * This function takes the skb with 802.3 header and reformats the header to
2589 * the appropriate IEEE 802.11 header based on which interface the packet is
2590 * being transmitted on.
2591 *
2592 * Note that this function also takes care of the TX status request and
2593 * potential unsharing of the SKB - this needs to be interleaved with the
2594 * header building.
2595 *
2596 * The function requires the read-side RCU lock held
2597 *
2598 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2599 */
ieee80211_build_hdr(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags,struct sta_info * sta,u32 ctrl_flags,u64 * cookie)2600 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2601 struct sk_buff *skb, u32 info_flags,
2602 struct sta_info *sta, u32 ctrl_flags,
2603 u64 *cookie)
2604 {
2605 struct ieee80211_local *local = sdata->local;
2606 struct ieee80211_tx_info *info;
2607 int head_need;
2608 u16 ethertype, hdrlen, meshhdrlen = 0;
2609 __le16 fc;
2610 struct ieee80211_hdr hdr;
2611 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2612 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2613 const u8 *encaps_data;
2614 int encaps_len, skip_header_bytes;
2615 bool wme_sta = false, authorized = false;
2616 bool tdls_peer;
2617 bool multicast;
2618 u16 info_id = 0;
2619 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
2620 enum nl80211_band band;
2621 int ret;
2622 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK);
2623
2624 if (IS_ERR(sta))
2625 sta = NULL;
2626
2627 #ifdef CONFIG_MAC80211_DEBUGFS
2628 if (local->force_tx_status)
2629 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2630 #endif
2631
2632 /* convert Ethernet header to proper 802.11 header (based on
2633 * operation mode) */
2634 ethertype = (skb->data[12] << 8) | skb->data[13];
2635 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2636
2637 if (!sdata->vif.valid_links)
2638 chanctx_conf =
2639 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2640
2641 switch (sdata->vif.type) {
2642 case NL80211_IFTYPE_AP_VLAN:
2643 if (sdata->wdev.use_4addr) {
2644 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2645 /* RA TA DA SA */
2646 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2647 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2648 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2649 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2650 hdrlen = 30;
2651 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2652 wme_sta = sta->sta.wme;
2653 }
2654 if (!sdata->vif.valid_links) {
2655 struct ieee80211_sub_if_data *ap_sdata;
2656
2657 /* override chanctx_conf from AP (we don't have one) */
2658 ap_sdata = container_of(sdata->bss,
2659 struct ieee80211_sub_if_data,
2660 u.ap);
2661 chanctx_conf =
2662 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
2663 }
2664 if (sdata->wdev.use_4addr)
2665 break;
2666 fallthrough;
2667 case NL80211_IFTYPE_AP:
2668 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2669 /* DA BSSID SA */
2670 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2671
2672 if (sdata->vif.valid_links && sta && !sta->sta.mlo) {
2673 struct ieee80211_link_data *link;
2674
2675 link_id = sta->deflink.link_id;
2676 link = rcu_dereference(sdata->link[link_id]);
2677 if (WARN_ON(!link)) {
2678 ret = -ENOLINK;
2679 goto free;
2680 }
2681 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN);
2682 } else if (link_id == IEEE80211_LINK_UNSPECIFIED ||
2683 (sta && sta->sta.mlo)) {
2684 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2685 } else {
2686 struct ieee80211_bss_conf *conf;
2687
2688 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2689 if (unlikely(!conf)) {
2690 ret = -ENOLINK;
2691 goto free;
2692 }
2693
2694 memcpy(hdr.addr2, conf->addr, ETH_ALEN);
2695 }
2696
2697 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2698 hdrlen = 24;
2699 break;
2700 #ifdef CONFIG_MAC80211_MESH
2701 case NL80211_IFTYPE_MESH_POINT:
2702 if (!is_multicast_ether_addr(skb->data)) {
2703 struct sta_info *next_hop;
2704 bool mpp_lookup = true;
2705
2706 mpath = mesh_path_lookup(sdata, skb->data);
2707 if (mpath) {
2708 mpp_lookup = false;
2709 next_hop = rcu_dereference(mpath->next_hop);
2710 if (!next_hop ||
2711 !(mpath->flags & (MESH_PATH_ACTIVE |
2712 MESH_PATH_RESOLVING)))
2713 mpp_lookup = true;
2714 }
2715
2716 if (mpp_lookup) {
2717 mppath = mpp_path_lookup(sdata, skb->data);
2718 if (mppath)
2719 mppath->exp_time = jiffies;
2720 }
2721
2722 if (mppath && mpath)
2723 mesh_path_del(sdata, mpath->dst);
2724 }
2725
2726 /*
2727 * Use address extension if it is a packet from
2728 * another interface or if we know the destination
2729 * is being proxied by a portal (i.e. portal address
2730 * differs from proxied address)
2731 */
2732 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2733 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2734 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2735 skb->data, skb->data + ETH_ALEN);
2736 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2737 NULL, NULL);
2738 } else {
2739 /* DS -> MBSS (802.11-2012 13.11.3.3).
2740 * For unicast with unknown forwarding information,
2741 * destination might be in the MBSS or if that fails
2742 * forwarded to another mesh gate. In either case
2743 * resolution will be handled in ieee80211_xmit(), so
2744 * leave the original DA. This also works for mcast */
2745 const u8 *mesh_da = skb->data;
2746
2747 if (mppath)
2748 mesh_da = mppath->mpp;
2749 else if (mpath)
2750 mesh_da = mpath->dst;
2751
2752 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2753 mesh_da, sdata->vif.addr);
2754 if (is_multicast_ether_addr(mesh_da))
2755 /* DA TA mSA AE:SA */
2756 meshhdrlen = ieee80211_new_mesh_header(
2757 sdata, &mesh_hdr,
2758 skb->data + ETH_ALEN, NULL);
2759 else
2760 /* RA TA mDA mSA AE:DA SA */
2761 meshhdrlen = ieee80211_new_mesh_header(
2762 sdata, &mesh_hdr, skb->data,
2763 skb->data + ETH_ALEN);
2764
2765 }
2766
2767 /* For injected frames, fill RA right away as nexthop lookup
2768 * will be skipped.
2769 */
2770 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2771 is_zero_ether_addr(hdr.addr1))
2772 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2773 break;
2774 #endif
2775 case NL80211_IFTYPE_STATION:
2776 /* we already did checks when looking up the RA STA */
2777 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2778
2779 if (tdls_peer) {
2780 /* DA SA BSSID */
2781 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2782 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2783 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN);
2784 hdrlen = 24;
2785 } else if (sdata->u.mgd.use_4addr &&
2786 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2787 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2788 IEEE80211_FCTL_TODS);
2789 /* RA TA DA SA */
2790 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
2791 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2792 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2793 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2794 hdrlen = 30;
2795 } else {
2796 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2797 /* BSSID SA DA */
2798 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
2799 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2800 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2801 hdrlen = 24;
2802 }
2803 break;
2804 case NL80211_IFTYPE_OCB:
2805 /* DA SA BSSID */
2806 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2807 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2808 eth_broadcast_addr(hdr.addr3);
2809 hdrlen = 24;
2810 break;
2811 case NL80211_IFTYPE_ADHOC:
2812 /* DA SA BSSID */
2813 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2814 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2815 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2816 hdrlen = 24;
2817 break;
2818 default:
2819 ret = -EINVAL;
2820 goto free;
2821 }
2822
2823 if (!chanctx_conf) {
2824 if (!sdata->vif.valid_links) {
2825 ret = -ENOTCONN;
2826 goto free;
2827 }
2828 /* MLD transmissions must not rely on the band */
2829 band = 0;
2830 } else {
2831 band = chanctx_conf->def.chan->band;
2832 }
2833
2834 multicast = is_multicast_ether_addr(hdr.addr1);
2835
2836 /* sta is always NULL for mesh */
2837 if (sta) {
2838 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2839 wme_sta = sta->sta.wme;
2840 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2841 /* For mesh, the use of the QoS header is mandatory */
2842 wme_sta = true;
2843 }
2844
2845 /* receiver does QoS (which also means we do) use it */
2846 if (wme_sta) {
2847 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2848 hdrlen += 2;
2849 }
2850
2851 /*
2852 * Drop unicast frames to unauthorised stations unless they are
2853 * EAPOL frames from the local station.
2854 */
2855 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2856 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2857 !multicast && !authorized &&
2858 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2859 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) {
2860 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2861 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2862 sdata->name, hdr.addr1);
2863 #endif
2864
2865 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2866
2867 ret = -EPERM;
2868 goto free;
2869 }
2870
2871 if (unlikely(!multicast && ((skb->sk &&
2872 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) ||
2873 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
2874 info_id = ieee80211_store_ack_skb(local, skb, &info_flags,
2875 cookie);
2876
2877 /*
2878 * If the skb is shared we need to obtain our own copy.
2879 */
2880 skb = skb_share_check(skb, GFP_ATOMIC);
2881 if (unlikely(!skb)) {
2882 ret = -ENOMEM;
2883 goto free;
2884 }
2885
2886 hdr.frame_control = fc;
2887 hdr.duration_id = 0;
2888 hdr.seq_ctrl = 0;
2889
2890 skip_header_bytes = ETH_HLEN;
2891 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2892 encaps_data = bridge_tunnel_header;
2893 encaps_len = sizeof(bridge_tunnel_header);
2894 skip_header_bytes -= 2;
2895 } else if (ethertype >= ETH_P_802_3_MIN) {
2896 encaps_data = rfc1042_header;
2897 encaps_len = sizeof(rfc1042_header);
2898 skip_header_bytes -= 2;
2899 } else {
2900 encaps_data = NULL;
2901 encaps_len = 0;
2902 }
2903
2904 skb_pull(skb, skip_header_bytes);
2905 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2906
2907 /*
2908 * So we need to modify the skb header and hence need a copy of
2909 * that. The head_need variable above doesn't, so far, include
2910 * the needed header space that we don't need right away. If we
2911 * can, then we don't reallocate right now but only after the
2912 * frame arrives at the master device (if it does...)
2913 *
2914 * If we cannot, however, then we will reallocate to include all
2915 * the ever needed space. Also, if we need to reallocate it anyway,
2916 * make it big enough for everything we may ever need.
2917 */
2918
2919 if (head_need > 0 || skb_cloned(skb)) {
2920 head_need += IEEE80211_ENCRYPT_HEADROOM;
2921 head_need += local->tx_headroom;
2922 head_need = max_t(int, 0, head_need);
2923 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2924 ieee80211_free_txskb(&local->hw, skb);
2925 skb = NULL;
2926 return ERR_PTR(-ENOMEM);
2927 }
2928 }
2929
2930 if (encaps_data)
2931 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2932
2933 #ifdef CONFIG_MAC80211_MESH
2934 if (meshhdrlen > 0)
2935 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2936 #endif
2937
2938 if (ieee80211_is_data_qos(fc)) {
2939 __le16 *qos_control;
2940
2941 qos_control = skb_push(skb, 2);
2942 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2943 /*
2944 * Maybe we could actually set some fields here, for now just
2945 * initialise to zero to indicate no special operation.
2946 */
2947 *qos_control = 0;
2948 } else
2949 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2950
2951 skb_reset_mac_header(skb);
2952
2953 info = IEEE80211_SKB_CB(skb);
2954 memset(info, 0, sizeof(*info));
2955
2956 info->flags = info_flags;
2957 info->ack_frame_id = info_id;
2958 info->band = band;
2959
2960 if (likely(!cookie)) {
2961 ctrl_flags |= u32_encode_bits(link_id,
2962 IEEE80211_TX_CTRL_MLO_LINK);
2963 } else {
2964 unsigned int pre_conf_link_id;
2965
2966 /*
2967 * ctrl_flags already have been set by
2968 * ieee80211_tx_control_port(), here
2969 * we just sanity check that
2970 */
2971
2972 pre_conf_link_id = u32_get_bits(ctrl_flags,
2973 IEEE80211_TX_CTRL_MLO_LINK);
2974
2975 if (pre_conf_link_id != link_id &&
2976 link_id != IEEE80211_LINK_UNSPECIFIED) {
2977 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2978 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
2979 sdata->name, hdr.addr1,
2980 pre_conf_link_id, link_id);
2981 #endif
2982 ret = -EINVAL;
2983 goto free;
2984 }
2985 }
2986
2987 info->control.flags = ctrl_flags;
2988
2989 return skb;
2990 free:
2991 kfree_skb(skb);
2992 return ERR_PTR(ret);
2993 }
2994
2995 /*
2996 * fast-xmit overview
2997 *
2998 * The core idea of this fast-xmit is to remove per-packet checks by checking
2999 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
3000 * checks that are needed to get the sta->fast_tx pointer assigned, after which
3001 * much less work can be done per packet. For example, fragmentation must be
3002 * disabled or the fast_tx pointer will not be set. All the conditions are seen
3003 * in the code here.
3004 *
3005 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
3006 * header and other data to aid packet processing in ieee80211_xmit_fast().
3007 *
3008 * The most difficult part of this is that when any of these assumptions
3009 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
3010 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
3011 * since the per-packet code no longer checks the conditions. This is reflected
3012 * by the calls to these functions throughout the rest of the code, and must be
3013 * maintained if any of the TX path checks change.
3014 */
3015
ieee80211_check_fast_xmit(struct sta_info * sta)3016 void ieee80211_check_fast_xmit(struct sta_info *sta)
3017 {
3018 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
3019 struct ieee80211_local *local = sta->local;
3020 struct ieee80211_sub_if_data *sdata = sta->sdata;
3021 struct ieee80211_hdr *hdr = (void *)build.hdr;
3022 struct ieee80211_chanctx_conf *chanctx_conf;
3023 __le16 fc;
3024
3025 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
3026 return;
3027
3028 /* Locking here protects both the pointer itself, and against concurrent
3029 * invocations winning data access races to, e.g., the key pointer that
3030 * is used.
3031 * Without it, the invocation of this function right after the key
3032 * pointer changes wouldn't be sufficient, as another CPU could access
3033 * the pointer, then stall, and then do the cache update after the CPU
3034 * that invalidated the key.
3035 * With the locking, such scenarios cannot happen as the check for the
3036 * key and the fast-tx assignment are done atomically, so the CPU that
3037 * modifies the key will either wait or other one will see the key
3038 * cleared/changed already.
3039 */
3040 spin_lock_bh(&sta->lock);
3041 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3042 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3043 sdata->vif.type == NL80211_IFTYPE_STATION)
3044 goto out;
3045
3046 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
3047 goto out;
3048
3049 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
3050 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
3051 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
3052 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
3053 goto out;
3054
3055 if (sdata->noack_map)
3056 goto out;
3057
3058 /* fast-xmit doesn't handle fragmentation at all */
3059 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
3060 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
3061 goto out;
3062
3063 if (!sdata->vif.valid_links) {
3064 rcu_read_lock();
3065 chanctx_conf =
3066 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
3067 if (!chanctx_conf) {
3068 rcu_read_unlock();
3069 goto out;
3070 }
3071 build.band = chanctx_conf->def.chan->band;
3072 rcu_read_unlock();
3073 } else {
3074 /* MLD transmissions must not rely on the band */
3075 build.band = 0;
3076 }
3077
3078 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
3079
3080 switch (sdata->vif.type) {
3081 case NL80211_IFTYPE_ADHOC:
3082 /* DA SA BSSID */
3083 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3084 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3085 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
3086 build.hdr_len = 24;
3087 break;
3088 case NL80211_IFTYPE_STATION:
3089 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
3090 /* DA SA BSSID */
3091 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3092 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3093 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3094 build.hdr_len = 24;
3095 break;
3096 }
3097
3098 if (sdata->u.mgd.use_4addr) {
3099 /* non-regular ethertype cannot use the fastpath */
3100 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3101 IEEE80211_FCTL_TODS);
3102 /* RA TA DA SA */
3103 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3104 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3105 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3106 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3107 build.hdr_len = 30;
3108 break;
3109 }
3110 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
3111 /* BSSID SA DA */
3112 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
3113 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3114 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3115 build.hdr_len = 24;
3116 break;
3117 case NL80211_IFTYPE_AP_VLAN:
3118 if (sdata->wdev.use_4addr) {
3119 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3120 IEEE80211_FCTL_TODS);
3121 /* RA TA DA SA */
3122 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
3123 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3124 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3125 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3126 build.hdr_len = 30;
3127 break;
3128 }
3129 fallthrough;
3130 case NL80211_IFTYPE_AP:
3131 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
3132 /* DA BSSID SA */
3133 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3134 if (sta->sta.mlo || !sdata->vif.valid_links) {
3135 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3136 } else {
3137 unsigned int link_id = sta->deflink.link_id;
3138 struct ieee80211_link_data *link;
3139
3140 rcu_read_lock();
3141 link = rcu_dereference(sdata->link[link_id]);
3142 if (WARN_ON(!link)) {
3143 rcu_read_unlock();
3144 goto out;
3145 }
3146 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN);
3147 rcu_read_unlock();
3148 }
3149 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3150 build.hdr_len = 24;
3151 break;
3152 default:
3153 /* not handled on fast-xmit */
3154 goto out;
3155 }
3156
3157 if (sta->sta.wme) {
3158 build.hdr_len += 2;
3159 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3160 }
3161
3162 /* We store the key here so there's no point in using rcu_dereference()
3163 * but that's fine because the code that changes the pointers will call
3164 * this function after doing so. For a single CPU that would be enough,
3165 * for multiple see the comment above.
3166 */
3167 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3168 if (!build.key)
3169 build.key = rcu_access_pointer(sdata->default_unicast_key);
3170 if (build.key) {
3171 bool gen_iv, iv_spc, mmic;
3172
3173 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3174 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3175 mmic = build.key->conf.flags &
3176 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
3177 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3178
3179 /* don't handle software crypto */
3180 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3181 goto out;
3182
3183 /* Key is being removed */
3184 if (build.key->flags & KEY_FLAG_TAINTED)
3185 goto out;
3186
3187 switch (build.key->conf.cipher) {
3188 case WLAN_CIPHER_SUITE_CCMP:
3189 case WLAN_CIPHER_SUITE_CCMP_256:
3190 if (gen_iv)
3191 build.pn_offs = build.hdr_len;
3192 if (gen_iv || iv_spc)
3193 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3194 break;
3195 case WLAN_CIPHER_SUITE_GCMP:
3196 case WLAN_CIPHER_SUITE_GCMP_256:
3197 if (gen_iv)
3198 build.pn_offs = build.hdr_len;
3199 if (gen_iv || iv_spc)
3200 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3201 break;
3202 case WLAN_CIPHER_SUITE_TKIP:
3203 /* cannot handle MMIC or IV generation in xmit-fast */
3204 if (mmic || gen_iv)
3205 goto out;
3206 if (iv_spc)
3207 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3208 break;
3209 case WLAN_CIPHER_SUITE_WEP40:
3210 case WLAN_CIPHER_SUITE_WEP104:
3211 /* cannot handle IV generation in fast-xmit */
3212 if (gen_iv)
3213 goto out;
3214 if (iv_spc)
3215 build.hdr_len += IEEE80211_WEP_IV_LEN;
3216 break;
3217 case WLAN_CIPHER_SUITE_AES_CMAC:
3218 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3219 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3220 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3221 WARN(1,
3222 "management cipher suite 0x%x enabled for data\n",
3223 build.key->conf.cipher);
3224 goto out;
3225 default:
3226 /* we don't know how to generate IVs for this at all */
3227 if (WARN_ON(gen_iv))
3228 goto out;
3229 }
3230
3231 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3232 }
3233
3234 hdr->frame_control = fc;
3235
3236 memcpy(build.hdr + build.hdr_len,
3237 rfc1042_header, sizeof(rfc1042_header));
3238 build.hdr_len += sizeof(rfc1042_header);
3239
3240 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3241 /* if the kmemdup fails, continue w/o fast_tx */
3242
3243 out:
3244 /* we might have raced against another call to this function */
3245 old = rcu_dereference_protected(sta->fast_tx,
3246 lockdep_is_held(&sta->lock));
3247 rcu_assign_pointer(sta->fast_tx, fast_tx);
3248 if (old)
3249 kfree_rcu(old, rcu_head);
3250 spin_unlock_bh(&sta->lock);
3251 }
3252
ieee80211_check_fast_xmit_all(struct ieee80211_local * local)3253 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3254 {
3255 struct sta_info *sta;
3256
3257 rcu_read_lock();
3258 list_for_each_entry_rcu(sta, &local->sta_list, list)
3259 ieee80211_check_fast_xmit(sta);
3260 rcu_read_unlock();
3261 }
3262
ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data * sdata)3263 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3264 {
3265 struct ieee80211_local *local = sdata->local;
3266 struct sta_info *sta;
3267
3268 rcu_read_lock();
3269
3270 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3271 if (sdata != sta->sdata &&
3272 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3273 continue;
3274 ieee80211_check_fast_xmit(sta);
3275 }
3276
3277 rcu_read_unlock();
3278 }
3279
ieee80211_clear_fast_xmit(struct sta_info * sta)3280 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3281 {
3282 struct ieee80211_fast_tx *fast_tx;
3283
3284 spin_lock_bh(&sta->lock);
3285 fast_tx = rcu_dereference_protected(sta->fast_tx,
3286 lockdep_is_held(&sta->lock));
3287 RCU_INIT_POINTER(sta->fast_tx, NULL);
3288 spin_unlock_bh(&sta->lock);
3289
3290 if (fast_tx)
3291 kfree_rcu(fast_tx, rcu_head);
3292 }
3293
ieee80211_amsdu_realloc_pad(struct ieee80211_local * local,struct sk_buff * skb,int headroom)3294 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3295 struct sk_buff *skb, int headroom)
3296 {
3297 if (skb_headroom(skb) < headroom) {
3298 I802_DEBUG_INC(local->tx_expand_skb_head);
3299
3300 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3301 wiphy_debug(local->hw.wiphy,
3302 "failed to reallocate TX buffer\n");
3303 return false;
3304 }
3305 }
3306
3307 return true;
3308 }
3309
ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data * sdata,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3310 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3311 struct ieee80211_fast_tx *fast_tx,
3312 struct sk_buff *skb)
3313 {
3314 struct ieee80211_local *local = sdata->local;
3315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3316 struct ieee80211_hdr *hdr;
3317 struct ethhdr *amsdu_hdr;
3318 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3319 int subframe_len = skb->len - hdr_len;
3320 void *data;
3321 u8 *qc, *h_80211_src, *h_80211_dst;
3322 const u8 *bssid;
3323
3324 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3325 return false;
3326
3327 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3328 return true;
3329
3330 if (!ieee80211_amsdu_realloc_pad(local, skb,
3331 sizeof(*amsdu_hdr) +
3332 local->hw.extra_tx_headroom))
3333 return false;
3334
3335 data = skb_push(skb, sizeof(*amsdu_hdr));
3336 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3337 hdr = data;
3338 amsdu_hdr = data + hdr_len;
3339 /* h_80211_src/dst is addr* field within hdr */
3340 h_80211_src = data + fast_tx->sa_offs;
3341 h_80211_dst = data + fast_tx->da_offs;
3342
3343 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3344 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3345 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3346
3347 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3348 * fields needs to be changed to BSSID for A-MSDU frames depending
3349 * on FromDS/ToDS values.
3350 */
3351 switch (sdata->vif.type) {
3352 case NL80211_IFTYPE_STATION:
3353 bssid = sdata->vif.cfg.ap_addr;
3354 break;
3355 case NL80211_IFTYPE_AP:
3356 case NL80211_IFTYPE_AP_VLAN:
3357 bssid = sdata->vif.addr;
3358 break;
3359 default:
3360 bssid = NULL;
3361 }
3362
3363 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3364 ether_addr_copy(h_80211_src, bssid);
3365
3366 if (bssid && ieee80211_has_tods(hdr->frame_control))
3367 ether_addr_copy(h_80211_dst, bssid);
3368
3369 qc = ieee80211_get_qos_ctl(hdr);
3370 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3371
3372 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3373
3374 return true;
3375 }
3376
ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3377 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3378 struct sta_info *sta,
3379 struct ieee80211_fast_tx *fast_tx,
3380 struct sk_buff *skb)
3381 {
3382 struct ieee80211_local *local = sdata->local;
3383 struct fq *fq = &local->fq;
3384 struct fq_tin *tin;
3385 struct fq_flow *flow;
3386 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3387 struct ieee80211_txq *txq = sta->sta.txq[tid];
3388 struct txq_info *txqi;
3389 struct sk_buff **frag_tail, *head;
3390 int subframe_len = skb->len - ETH_ALEN;
3391 u8 max_subframes = sta->sta.max_amsdu_subframes;
3392 int max_frags = local->hw.max_tx_fragments;
3393 int max_amsdu_len = sta->sta.cur->max_amsdu_len;
3394 int orig_truesize;
3395 u32 flow_idx;
3396 __be16 len;
3397 void *data;
3398 bool ret = false;
3399 unsigned int orig_len;
3400 int n = 2, nfrags, pad = 0;
3401 u16 hdrlen;
3402
3403 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3404 return false;
3405
3406 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
3407 return false;
3408
3409 if (skb_is_gso(skb))
3410 return false;
3411
3412 if (!txq)
3413 return false;
3414
3415 txqi = to_txq_info(txq);
3416 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3417 return false;
3418
3419 if (sta->sta.cur->max_rc_amsdu_len)
3420 max_amsdu_len = min_t(int, max_amsdu_len,
3421 sta->sta.cur->max_rc_amsdu_len);
3422
3423 if (sta->sta.cur->max_tid_amsdu_len[tid])
3424 max_amsdu_len = min_t(int, max_amsdu_len,
3425 sta->sta.cur->max_tid_amsdu_len[tid]);
3426
3427 flow_idx = fq_flow_idx(fq, skb);
3428
3429 spin_lock_bh(&fq->lock);
3430
3431 /* TODO: Ideally aggregation should be done on dequeue to remain
3432 * responsive to environment changes.
3433 */
3434
3435 tin = &txqi->tin;
3436 flow = fq_flow_classify(fq, tin, flow_idx, skb);
3437 head = skb_peek_tail(&flow->queue);
3438 if (!head || skb_is_gso(head))
3439 goto out;
3440
3441 orig_truesize = head->truesize;
3442 orig_len = head->len;
3443
3444 if (skb->len + head->len > max_amsdu_len)
3445 goto out;
3446
3447 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3448 nfrags += 1 + skb_shinfo(head)->nr_frags;
3449 frag_tail = &skb_shinfo(head)->frag_list;
3450 while (*frag_tail) {
3451 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3452 frag_tail = &(*frag_tail)->next;
3453 n++;
3454 }
3455
3456 if (max_subframes && n > max_subframes)
3457 goto out;
3458
3459 if (max_frags && nfrags > max_frags)
3460 goto out;
3461
3462 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3463 goto out;
3464
3465 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3466 goto out;
3467
3468 /* If n == 2, the "while (*frag_tail)" loop above didn't execute
3469 * and frag_tail should be &skb_shinfo(head)->frag_list.
3470 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3471 * Reload frag_tail to have it pointing to the correct place.
3472 */
3473 if (n == 2)
3474 frag_tail = &skb_shinfo(head)->frag_list;
3475
3476 /*
3477 * Pad out the previous subframe to a multiple of 4 by adding the
3478 * padding to the next one, that's being added. Note that head->len
3479 * is the length of the full A-MSDU, but that works since each time
3480 * we add a new subframe we pad out the previous one to a multiple
3481 * of 4 and thus it no longer matters in the next round.
3482 */
3483 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3484 if ((head->len - hdrlen) & 3)
3485 pad = 4 - ((head->len - hdrlen) & 3);
3486
3487 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3488 2 + pad))
3489 goto out_recalc;
3490
3491 ret = true;
3492 data = skb_push(skb, ETH_ALEN + 2);
3493 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3494
3495 data += 2 * ETH_ALEN;
3496 len = cpu_to_be16(subframe_len);
3497 memcpy(data, &len, 2);
3498 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3499
3500 memset(skb_push(skb, pad), 0, pad);
3501
3502 head->len += skb->len;
3503 head->data_len += skb->len;
3504 *frag_tail = skb;
3505
3506 out_recalc:
3507 fq->memory_usage += head->truesize - orig_truesize;
3508 if (head->len != orig_len) {
3509 flow->backlog += head->len - orig_len;
3510 tin->backlog_bytes += head->len - orig_len;
3511 }
3512 out:
3513 spin_unlock_bh(&fq->lock);
3514
3515 return ret;
3516 }
3517
3518 /*
3519 * Can be called while the sta lock is held. Anything that can cause packets to
3520 * be generated will cause deadlock!
3521 */
3522 static ieee80211_tx_result
ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,u8 pn_offs,struct ieee80211_key * key,struct ieee80211_tx_data * tx)3523 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3524 struct sta_info *sta, u8 pn_offs,
3525 struct ieee80211_key *key,
3526 struct ieee80211_tx_data *tx)
3527 {
3528 struct sk_buff *skb = tx->skb;
3529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3530 struct ieee80211_hdr *hdr = (void *)skb->data;
3531 u8 tid = IEEE80211_NUM_TIDS;
3532
3533 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
3534 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
3535 return TX_DROP;
3536
3537 if (key)
3538 info->control.hw_key = &key->conf;
3539
3540 dev_sw_netstats_tx_add(skb->dev, 1, skb->len);
3541
3542 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3543 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3544 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3545 } else {
3546 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3547 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3548 sdata->sequence_number += 0x10;
3549 }
3550
3551 if (skb_shinfo(skb)->gso_size)
3552 sta->deflink.tx_stats.msdu[tid] +=
3553 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3554 else
3555 sta->deflink.tx_stats.msdu[tid]++;
3556
3557 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3558
3559 /* statistics normally done by ieee80211_tx_h_stats (but that
3560 * has to consider fragmentation, so is more complex)
3561 */
3562 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3563 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
3564
3565 if (pn_offs) {
3566 u64 pn;
3567 u8 *crypto_hdr = skb->data + pn_offs;
3568
3569 switch (key->conf.cipher) {
3570 case WLAN_CIPHER_SUITE_CCMP:
3571 case WLAN_CIPHER_SUITE_CCMP_256:
3572 case WLAN_CIPHER_SUITE_GCMP:
3573 case WLAN_CIPHER_SUITE_GCMP_256:
3574 pn = atomic64_inc_return(&key->conf.tx_pn);
3575 crypto_hdr[0] = pn;
3576 crypto_hdr[1] = pn >> 8;
3577 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3578 crypto_hdr[4] = pn >> 16;
3579 crypto_hdr[5] = pn >> 24;
3580 crypto_hdr[6] = pn >> 32;
3581 crypto_hdr[7] = pn >> 40;
3582 break;
3583 }
3584 }
3585
3586 return TX_CONTINUE;
3587 }
3588
ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3589 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3590 struct sta_info *sta,
3591 struct ieee80211_fast_tx *fast_tx,
3592 struct sk_buff *skb)
3593 {
3594 struct ieee80211_local *local = sdata->local;
3595 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3596 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3597 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3598 struct ethhdr eth;
3599 struct ieee80211_tx_info *info;
3600 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3601 struct ieee80211_tx_data tx;
3602 ieee80211_tx_result r;
3603 struct tid_ampdu_tx *tid_tx = NULL;
3604 u8 tid = IEEE80211_NUM_TIDS;
3605
3606 /* control port protocol needs a lot of special handling */
3607 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3608 return false;
3609
3610 /* only RFC 1042 SNAP */
3611 if (ethertype < ETH_P_802_3_MIN)
3612 return false;
3613
3614 /* don't handle TX status request here either */
3615 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3616 return false;
3617
3618 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3619 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3620 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3621 if (tid_tx) {
3622 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3623 return false;
3624 if (tid_tx->timeout)
3625 tid_tx->last_tx = jiffies;
3626 }
3627 }
3628
3629 /* after this point (skb is modified) we cannot return false */
3630
3631 skb = skb_share_check(skb, GFP_ATOMIC);
3632 if (unlikely(!skb))
3633 return true;
3634
3635 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3636 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3637 return true;
3638
3639 /* will not be crypto-handled beyond what we do here, so use false
3640 * as the may-encrypt argument for the resize to not account for
3641 * more room than we already have in 'extra_head'
3642 */
3643 if (unlikely(ieee80211_skb_resize(sdata, skb,
3644 max_t(int, extra_head + hw_headroom -
3645 skb_headroom(skb), 0),
3646 ENCRYPT_NO))) {
3647 kfree_skb(skb);
3648 return true;
3649 }
3650
3651 memcpy(ð, skb->data, ETH_HLEN - 2);
3652 hdr = skb_push(skb, extra_head);
3653 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3654 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3655 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3656
3657 info = IEEE80211_SKB_CB(skb);
3658 memset(info, 0, sizeof(*info));
3659 info->band = fast_tx->band;
3660 info->control.vif = &sdata->vif;
3661 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3662 IEEE80211_TX_CTL_DONTFRAG |
3663 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3664 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT |
3665 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
3666 IEEE80211_TX_CTRL_MLO_LINK);
3667
3668 #ifdef CONFIG_MAC80211_DEBUGFS
3669 if (local->force_tx_status)
3670 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3671 #endif
3672
3673 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3674 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3675 *ieee80211_get_qos_ctl(hdr) = tid;
3676 }
3677
3678 __skb_queue_head_init(&tx.skbs);
3679
3680 tx.flags = IEEE80211_TX_UNICAST;
3681 tx.local = local;
3682 tx.sdata = sdata;
3683 tx.sta = sta;
3684 tx.key = fast_tx->key;
3685
3686 if (ieee80211_queue_skb(local, sdata, sta, skb))
3687 return true;
3688
3689 tx.skb = skb;
3690 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3691 fast_tx->key, &tx);
3692 tx.skb = NULL;
3693 if (r == TX_DROP) {
3694 kfree_skb(skb);
3695 return true;
3696 }
3697
3698 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3699 sdata = container_of(sdata->bss,
3700 struct ieee80211_sub_if_data, u.ap);
3701
3702 __skb_queue_tail(&tx.skbs, skb);
3703 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
3704 return true;
3705 }
3706
ieee80211_tx_dequeue(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3707 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3708 struct ieee80211_txq *txq)
3709 {
3710 struct ieee80211_local *local = hw_to_local(hw);
3711 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3712 struct ieee80211_hdr *hdr;
3713 struct fq *fq = &local->fq;
3714 struct fq_tin *tin = &txqi->tin;
3715 struct ieee80211_tx_info *info;
3716 struct ieee80211_tx_data tx;
3717 struct sk_buff *skb;
3718 ieee80211_tx_result r;
3719 struct ieee80211_vif *vif = txq->vif;
3720 int q = vif->hw_queue[txq->ac];
3721 bool q_stopped;
3722
3723 WARN_ON_ONCE(softirq_count() == 0);
3724
3725 if (!ieee80211_txq_airtime_check(hw, txq))
3726 return NULL;
3727
3728 begin:
3729 spin_lock(&local->queue_stop_reason_lock);
3730 q_stopped = local->queue_stop_reasons[q];
3731 spin_unlock(&local->queue_stop_reason_lock);
3732
3733 if (unlikely(q_stopped)) {
3734 /* mark for waking later */
3735 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags);
3736 return NULL;
3737 }
3738
3739 spin_lock_bh(&fq->lock);
3740
3741 /* Make sure fragments stay together. */
3742 skb = __skb_dequeue(&txqi->frags);
3743 if (unlikely(skb)) {
3744 if (!(IEEE80211_SKB_CB(skb)->control.flags &
3745 IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
3746 goto out;
3747 IEEE80211_SKB_CB(skb)->control.flags &=
3748 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3749 } else {
3750 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags)))
3751 goto out;
3752
3753 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3754 }
3755
3756 if (!skb)
3757 goto out;
3758
3759 spin_unlock_bh(&fq->lock);
3760
3761 hdr = (struct ieee80211_hdr *)skb->data;
3762 info = IEEE80211_SKB_CB(skb);
3763
3764 memset(&tx, 0, sizeof(tx));
3765 __skb_queue_head_init(&tx.skbs);
3766 tx.local = local;
3767 tx.skb = skb;
3768 tx.sdata = vif_to_sdata(info->control.vif);
3769
3770 if (txq->sta) {
3771 tx.sta = container_of(txq->sta, struct sta_info, sta);
3772 /*
3773 * Drop unicast frames to unauthorised stations unless they are
3774 * injected frames or EAPOL frames from the local station.
3775 */
3776 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
3777 ieee80211_is_data(hdr->frame_control) &&
3778 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3779 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3780 !is_multicast_ether_addr(hdr->addr1) &&
3781 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3782 (!(info->control.flags &
3783 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3784 !ieee80211_is_our_addr(tx.sdata, hdr->addr2,
3785 NULL)))) {
3786 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3787 ieee80211_free_txskb(&local->hw, skb);
3788 goto begin;
3789 }
3790 }
3791
3792 /*
3793 * The key can be removed while the packet was queued, so need to call
3794 * this here to get the current key.
3795 */
3796 r = ieee80211_tx_h_select_key(&tx);
3797 if (r != TX_CONTINUE) {
3798 ieee80211_free_txskb(&local->hw, skb);
3799 goto begin;
3800 }
3801
3802 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3803 info->flags |= (IEEE80211_TX_CTL_AMPDU |
3804 IEEE80211_TX_CTL_DONTFRAG);
3805 else
3806 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3807
3808 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
3809 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3810 r = ieee80211_tx_h_rate_ctrl(&tx);
3811 if (r != TX_CONTINUE) {
3812 ieee80211_free_txskb(&local->hw, skb);
3813 goto begin;
3814 }
3815 }
3816 goto encap_out;
3817 }
3818
3819 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3820 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3821 sta);
3822 u8 pn_offs = 0;
3823
3824 if (tx.key &&
3825 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3826 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3827
3828 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3829 tx.key, &tx);
3830 if (r != TX_CONTINUE) {
3831 ieee80211_free_txskb(&local->hw, skb);
3832 goto begin;
3833 }
3834 } else {
3835 if (invoke_tx_handlers_late(&tx))
3836 goto begin;
3837
3838 skb = __skb_dequeue(&tx.skbs);
3839
3840 if (!skb_queue_empty(&tx.skbs)) {
3841 spin_lock_bh(&fq->lock);
3842 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3843 spin_unlock_bh(&fq->lock);
3844 }
3845 }
3846
3847 if (skb_has_frag_list(skb) &&
3848 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3849 if (skb_linearize(skb)) {
3850 ieee80211_free_txskb(&local->hw, skb);
3851 goto begin;
3852 }
3853 }
3854
3855 switch (tx.sdata->vif.type) {
3856 case NL80211_IFTYPE_MONITOR:
3857 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3858 vif = &tx.sdata->vif;
3859 break;
3860 }
3861 tx.sdata = rcu_dereference(local->monitor_sdata);
3862 if (tx.sdata) {
3863 vif = &tx.sdata->vif;
3864 info->hw_queue =
3865 vif->hw_queue[skb_get_queue_mapping(skb)];
3866 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3867 ieee80211_free_txskb(&local->hw, skb);
3868 goto begin;
3869 } else {
3870 vif = NULL;
3871 }
3872 break;
3873 case NL80211_IFTYPE_AP_VLAN:
3874 tx.sdata = container_of(tx.sdata->bss,
3875 struct ieee80211_sub_if_data, u.ap);
3876 fallthrough;
3877 default:
3878 vif = &tx.sdata->vif;
3879 break;
3880 }
3881
3882 encap_out:
3883 IEEE80211_SKB_CB(skb)->control.vif = vif;
3884
3885 if (tx.sta &&
3886 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
3887 bool ampdu = txq->ac != IEEE80211_AC_VO;
3888 u32 airtime;
3889
3890 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
3891 skb->len, ampdu);
3892 if (airtime) {
3893 airtime = ieee80211_info_set_tx_time_est(info, airtime);
3894 ieee80211_sta_update_pending_airtime(local, tx.sta,
3895 txq->ac,
3896 airtime,
3897 false);
3898 }
3899 }
3900
3901 return skb;
3902
3903 out:
3904 spin_unlock_bh(&fq->lock);
3905
3906 return skb;
3907 }
3908 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3909
ieee80211_sta_deficit(struct sta_info * sta,u8 ac)3910 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
3911 {
3912 struct airtime_info *air_info = &sta->airtime[ac];
3913
3914 return air_info->deficit - atomic_read(&air_info->aql_tx_pending);
3915 }
3916
3917 static void
ieee80211_txq_set_active(struct txq_info * txqi)3918 ieee80211_txq_set_active(struct txq_info *txqi)
3919 {
3920 struct sta_info *sta;
3921
3922 if (!txqi->txq.sta)
3923 return;
3924
3925 sta = container_of(txqi->txq.sta, struct sta_info, sta);
3926 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies;
3927 }
3928
3929 static bool
ieee80211_txq_keep_active(struct txq_info * txqi)3930 ieee80211_txq_keep_active(struct txq_info *txqi)
3931 {
3932 struct sta_info *sta;
3933 u32 diff;
3934
3935 if (!txqi->txq.sta)
3936 return false;
3937
3938 sta = container_of(txqi->txq.sta, struct sta_info, sta);
3939 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0)
3940 return false;
3941
3942 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active;
3943
3944 return diff <= AIRTIME_ACTIVE_DURATION;
3945 }
3946
ieee80211_next_txq(struct ieee80211_hw * hw,u8 ac)3947 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
3948 {
3949 struct ieee80211_local *local = hw_to_local(hw);
3950 struct ieee80211_txq *ret = NULL;
3951 struct txq_info *txqi = NULL, *head = NULL;
3952 bool found_eligible_txq = false;
3953
3954 spin_lock_bh(&local->active_txq_lock[ac]);
3955
3956 if (!local->schedule_round[ac])
3957 goto out;
3958
3959 begin:
3960 txqi = list_first_entry_or_null(&local->active_txqs[ac],
3961 struct txq_info,
3962 schedule_order);
3963 if (!txqi)
3964 goto out;
3965
3966 if (txqi == head) {
3967 if (!found_eligible_txq)
3968 goto out;
3969 else
3970 found_eligible_txq = false;
3971 }
3972
3973 if (!head)
3974 head = txqi;
3975
3976 if (txqi->txq.sta) {
3977 struct sta_info *sta = container_of(txqi->txq.sta,
3978 struct sta_info, sta);
3979 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq);
3980 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac);
3981
3982 if (aql_check)
3983 found_eligible_txq = true;
3984
3985 if (deficit < 0)
3986 sta->airtime[txqi->txq.ac].deficit +=
3987 sta->airtime_weight;
3988
3989 if (deficit < 0 || !aql_check) {
3990 list_move_tail(&txqi->schedule_order,
3991 &local->active_txqs[txqi->txq.ac]);
3992 goto begin;
3993 }
3994 }
3995
3996 if (txqi->schedule_round == local->schedule_round[ac])
3997 goto out;
3998
3999 list_del_init(&txqi->schedule_order);
4000 txqi->schedule_round = local->schedule_round[ac];
4001 ret = &txqi->txq;
4002
4003 out:
4004 spin_unlock_bh(&local->active_txq_lock[ac]);
4005 return ret;
4006 }
4007 EXPORT_SYMBOL(ieee80211_next_txq);
4008
__ieee80211_schedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool force)4009 void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
4010 struct ieee80211_txq *txq,
4011 bool force)
4012 {
4013 struct ieee80211_local *local = hw_to_local(hw);
4014 struct txq_info *txqi = to_txq_info(txq);
4015 bool has_queue;
4016
4017 spin_lock_bh(&local->active_txq_lock[txq->ac]);
4018
4019 has_queue = force || txq_has_queue(txq);
4020 if (list_empty(&txqi->schedule_order) &&
4021 (has_queue || ieee80211_txq_keep_active(txqi))) {
4022 /* If airtime accounting is active, always enqueue STAs at the
4023 * head of the list to ensure that they only get moved to the
4024 * back by the airtime DRR scheduler once they have a negative
4025 * deficit. A station that already has a negative deficit will
4026 * get immediately moved to the back of the list on the next
4027 * call to ieee80211_next_txq().
4028 */
4029 if (txqi->txq.sta && local->airtime_flags && has_queue &&
4030 wiphy_ext_feature_isset(local->hw.wiphy,
4031 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
4032 list_add(&txqi->schedule_order,
4033 &local->active_txqs[txq->ac]);
4034 else
4035 list_add_tail(&txqi->schedule_order,
4036 &local->active_txqs[txq->ac]);
4037 if (has_queue)
4038 ieee80211_txq_set_active(txqi);
4039 }
4040
4041 spin_unlock_bh(&local->active_txq_lock[txq->ac]);
4042 }
4043 EXPORT_SYMBOL(__ieee80211_schedule_txq);
4044
4045 DEFINE_STATIC_KEY_FALSE(aql_disable);
4046
ieee80211_txq_airtime_check(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4047 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
4048 struct ieee80211_txq *txq)
4049 {
4050 struct sta_info *sta;
4051 struct ieee80211_local *local = hw_to_local(hw);
4052
4053 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4054 return true;
4055
4056 if (static_branch_unlikely(&aql_disable))
4057 return true;
4058
4059 if (!txq->sta)
4060 return true;
4061
4062 if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4063 return true;
4064
4065 sta = container_of(txq->sta, struct sta_info, sta);
4066 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4067 sta->airtime[txq->ac].aql_limit_low)
4068 return true;
4069
4070 if (atomic_read(&local->aql_total_pending_airtime) <
4071 local->aql_threshold &&
4072 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4073 sta->airtime[txq->ac].aql_limit_high)
4074 return true;
4075
4076 return false;
4077 }
4078 EXPORT_SYMBOL(ieee80211_txq_airtime_check);
4079
4080 static bool
ieee80211_txq_schedule_airtime_check(struct ieee80211_local * local,u8 ac)4081 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
4082 {
4083 unsigned int num_txq = 0;
4084 struct txq_info *txq;
4085 u32 aql_limit;
4086
4087 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4088 return true;
4089
4090 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order)
4091 num_txq++;
4092
4093 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 +
4094 local->aql_txq_limit_high[ac];
4095
4096 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit;
4097 }
4098
ieee80211_txq_may_transmit(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4099 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
4100 struct ieee80211_txq *txq)
4101 {
4102 struct ieee80211_local *local = hw_to_local(hw);
4103 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
4104 struct sta_info *sta;
4105 u8 ac = txq->ac;
4106
4107 spin_lock_bh(&local->active_txq_lock[ac]);
4108
4109 if (!txqi->txq.sta)
4110 goto out;
4111
4112 if (list_empty(&txqi->schedule_order))
4113 goto out;
4114
4115 if (!ieee80211_txq_schedule_airtime_check(local, ac))
4116 goto out;
4117
4118 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
4119 schedule_order) {
4120 if (iter == txqi)
4121 break;
4122
4123 if (!iter->txq.sta) {
4124 list_move_tail(&iter->schedule_order,
4125 &local->active_txqs[ac]);
4126 continue;
4127 }
4128 sta = container_of(iter->txq.sta, struct sta_info, sta);
4129 if (ieee80211_sta_deficit(sta, ac) < 0)
4130 sta->airtime[ac].deficit += sta->airtime_weight;
4131 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
4132 }
4133
4134 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4135 if (sta->airtime[ac].deficit >= 0)
4136 goto out;
4137
4138 sta->airtime[ac].deficit += sta->airtime_weight;
4139 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
4140 spin_unlock_bh(&local->active_txq_lock[ac]);
4141
4142 return false;
4143 out:
4144 if (!list_empty(&txqi->schedule_order))
4145 list_del_init(&txqi->schedule_order);
4146 spin_unlock_bh(&local->active_txq_lock[ac]);
4147
4148 return true;
4149 }
4150 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
4151
ieee80211_txq_schedule_start(struct ieee80211_hw * hw,u8 ac)4152 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
4153 {
4154 struct ieee80211_local *local = hw_to_local(hw);
4155
4156 spin_lock_bh(&local->active_txq_lock[ac]);
4157
4158 if (ieee80211_txq_schedule_airtime_check(local, ac)) {
4159 local->schedule_round[ac]++;
4160 if (!local->schedule_round[ac])
4161 local->schedule_round[ac]++;
4162 } else {
4163 local->schedule_round[ac] = 0;
4164 }
4165
4166 spin_unlock_bh(&local->active_txq_lock[ac]);
4167 }
4168 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
4169
__ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev,u32 info_flags,u32 ctrl_flags,u64 * cookie)4170 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
4171 struct net_device *dev,
4172 u32 info_flags,
4173 u32 ctrl_flags,
4174 u64 *cookie)
4175 {
4176 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4177 struct ieee80211_local *local = sdata->local;
4178 struct sta_info *sta;
4179 struct sk_buff *next;
4180 int len = skb->len;
4181
4182 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4183 kfree_skb(skb);
4184 return;
4185 }
4186
4187 rcu_read_lock();
4188
4189 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
4190 goto out_free;
4191
4192 if (IS_ERR(sta))
4193 sta = NULL;
4194
4195 if (local->ops->wake_tx_queue) {
4196 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
4197 skb_set_queue_mapping(skb, queue);
4198 skb_get_hash(skb);
4199 }
4200
4201 ieee80211_aggr_check(sdata, sta, skb);
4202
4203 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4204
4205 if (sta) {
4206 struct ieee80211_fast_tx *fast_tx;
4207
4208 fast_tx = rcu_dereference(sta->fast_tx);
4209
4210 if (fast_tx &&
4211 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
4212 goto out;
4213 }
4214
4215 if (skb_is_gso(skb)) {
4216 struct sk_buff *segs;
4217
4218 segs = skb_gso_segment(skb, 0);
4219 if (IS_ERR(segs)) {
4220 goto out_free;
4221 } else if (segs) {
4222 consume_skb(skb);
4223 skb = segs;
4224 }
4225 } else {
4226 /* we cannot process non-linear frames on this path */
4227 if (skb_linearize(skb))
4228 goto out_free;
4229
4230 /* the frame could be fragmented, software-encrypted, and other
4231 * things so we cannot really handle checksum offload with it -
4232 * fix it up in software before we handle anything else.
4233 */
4234 if (skb->ip_summed == CHECKSUM_PARTIAL) {
4235 skb_set_transport_header(skb,
4236 skb_checksum_start_offset(skb));
4237 if (skb_checksum_help(skb))
4238 goto out_free;
4239 }
4240 }
4241
4242 skb_list_walk_safe(skb, skb, next) {
4243 skb_mark_not_on_list(skb);
4244
4245 if (skb->protocol == sdata->control_port_protocol)
4246 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
4247
4248 skb = ieee80211_build_hdr(sdata, skb, info_flags,
4249 sta, ctrl_flags, cookie);
4250 if (IS_ERR(skb)) {
4251 kfree_skb_list(next);
4252 goto out;
4253 }
4254
4255 dev_sw_netstats_tx_add(dev, 1, skb->len);
4256
4257 ieee80211_xmit(sdata, sta, skb);
4258 }
4259 goto out;
4260 out_free:
4261 kfree_skb(skb);
4262 len = 0;
4263 out:
4264 if (len)
4265 ieee80211_tpt_led_trig_tx(local, len);
4266 rcu_read_unlock();
4267 }
4268
ieee80211_change_da(struct sk_buff * skb,struct sta_info * sta)4269 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
4270 {
4271 struct ethhdr *eth;
4272 int err;
4273
4274 err = skb_ensure_writable(skb, ETH_HLEN);
4275 if (unlikely(err))
4276 return err;
4277
4278 eth = (void *)skb->data;
4279 ether_addr_copy(eth->h_dest, sta->sta.addr);
4280
4281 return 0;
4282 }
4283
ieee80211_multicast_to_unicast(struct sk_buff * skb,struct net_device * dev)4284 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
4285 struct net_device *dev)
4286 {
4287 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4288 const struct ethhdr *eth = (void *)skb->data;
4289 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4290 __be16 ethertype;
4291
4292 switch (sdata->vif.type) {
4293 case NL80211_IFTYPE_AP_VLAN:
4294 if (sdata->u.vlan.sta)
4295 return false;
4296 if (sdata->wdev.use_4addr)
4297 return false;
4298 fallthrough;
4299 case NL80211_IFTYPE_AP:
4300 /* check runtime toggle for this bss */
4301 if (!sdata->bss->multicast_to_unicast)
4302 return false;
4303 break;
4304 default:
4305 return false;
4306 }
4307
4308 /* multicast to unicast conversion only for some payload */
4309 ethertype = eth->h_proto;
4310 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4311 ethertype = ethvlan->h_vlan_encapsulated_proto;
4312 switch (ethertype) {
4313 case htons(ETH_P_ARP):
4314 case htons(ETH_P_IP):
4315 case htons(ETH_P_IPV6):
4316 break;
4317 default:
4318 return false;
4319 }
4320
4321 return true;
4322 }
4323
4324 static void
ieee80211_convert_to_unicast(struct sk_buff * skb,struct net_device * dev,struct sk_buff_head * queue)4325 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4326 struct sk_buff_head *queue)
4327 {
4328 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4329 struct ieee80211_local *local = sdata->local;
4330 const struct ethhdr *eth = (struct ethhdr *)skb->data;
4331 struct sta_info *sta, *first = NULL;
4332 struct sk_buff *cloned_skb;
4333
4334 rcu_read_lock();
4335
4336 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4337 if (sdata != sta->sdata)
4338 /* AP-VLAN mismatch */
4339 continue;
4340 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4341 /* do not send back to source */
4342 continue;
4343 if (!first) {
4344 first = sta;
4345 continue;
4346 }
4347 cloned_skb = skb_clone(skb, GFP_ATOMIC);
4348 if (!cloned_skb)
4349 goto multicast;
4350 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4351 dev_kfree_skb(cloned_skb);
4352 goto multicast;
4353 }
4354 __skb_queue_tail(queue, cloned_skb);
4355 }
4356
4357 if (likely(first)) {
4358 if (unlikely(ieee80211_change_da(skb, first)))
4359 goto multicast;
4360 __skb_queue_tail(queue, skb);
4361 } else {
4362 /* no STA connected, drop */
4363 kfree_skb(skb);
4364 skb = NULL;
4365 }
4366
4367 goto out;
4368 multicast:
4369 __skb_queue_purge(queue);
4370 __skb_queue_tail(queue, skb);
4371 out:
4372 rcu_read_unlock();
4373 }
4374
ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 ctrl_flags,unsigned int link_id)4375 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata,
4376 struct sk_buff *skb, u32 ctrl_flags,
4377 unsigned int link_id)
4378 {
4379 struct sk_buff *out;
4380
4381 out = skb_copy(skb, GFP_ATOMIC);
4382 if (!out)
4383 return;
4384
4385 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK);
4386 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL);
4387 }
4388
ieee80211_mlo_multicast_tx(struct net_device * dev,struct sk_buff * skb)4389 static void ieee80211_mlo_multicast_tx(struct net_device *dev,
4390 struct sk_buff *skb)
4391 {
4392 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4393 unsigned long links = sdata->vif.valid_links;
4394 unsigned int link;
4395 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX;
4396
4397 if (hweight16(links) == 1) {
4398 ctrl_flags |= u32_encode_bits(ffs(links) - 1,
4399 IEEE80211_TX_CTRL_MLO_LINK);
4400
4401 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags,
4402 NULL);
4403 return;
4404 }
4405
4406 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) {
4407 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link);
4408 ctrl_flags = 0;
4409 }
4410 kfree_skb(skb);
4411 }
4412
4413 /**
4414 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4415 * @skb: packet to be sent
4416 * @dev: incoming interface
4417 *
4418 * On failure skb will be freed.
4419 */
ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)4420 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4421 struct net_device *dev)
4422 {
4423 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4424 const struct ethhdr *eth = (void *)skb->data;
4425
4426 if (likely(!is_multicast_ether_addr(eth->h_dest)))
4427 goto normal;
4428
4429 if (unlikely(!ieee80211_sdata_running(sdata))) {
4430 kfree_skb(skb);
4431 return NETDEV_TX_OK;
4432 }
4433
4434 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4435 struct sk_buff_head queue;
4436
4437 __skb_queue_head_init(&queue);
4438 ieee80211_convert_to_unicast(skb, dev, &queue);
4439 while ((skb = __skb_dequeue(&queue)))
4440 __ieee80211_subif_start_xmit(skb, dev, 0,
4441 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4442 NULL);
4443 } else if (sdata->vif.valid_links &&
4444 sdata->vif.type == NL80211_IFTYPE_AP &&
4445 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) {
4446 ieee80211_mlo_multicast_tx(dev, skb);
4447 } else {
4448 normal:
4449 __ieee80211_subif_start_xmit(skb, dev, 0,
4450 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4451 NULL);
4452 }
4453
4454 return NETDEV_TX_OK;
4455 }
4456
ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info * sta,bool txpending)4457 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4458 struct sk_buff *skb, struct sta_info *sta,
4459 bool txpending)
4460 {
4461 struct ieee80211_local *local = sdata->local;
4462 struct ieee80211_tx_control control = {};
4463 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4464 struct ieee80211_sta *pubsta = NULL;
4465 unsigned long flags;
4466 int q = info->hw_queue;
4467
4468 if (sta)
4469 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift);
4470
4471 ieee80211_tpt_led_trig_tx(local, skb->len);
4472
4473 if (ieee80211_queue_skb(local, sdata, sta, skb))
4474 return true;
4475
4476 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4477
4478 if (local->queue_stop_reasons[q] ||
4479 (!txpending && !skb_queue_empty(&local->pending[q]))) {
4480 if (txpending)
4481 skb_queue_head(&local->pending[q], skb);
4482 else
4483 skb_queue_tail(&local->pending[q], skb);
4484
4485 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4486
4487 return false;
4488 }
4489
4490 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4491
4492 if (sta && sta->uploaded)
4493 pubsta = &sta->sta;
4494
4495 control.sta = pubsta;
4496
4497 drv_tx(local, &control, skb);
4498
4499 return true;
4500 }
4501
ieee80211_8023_xmit(struct ieee80211_sub_if_data * sdata,struct net_device * dev,struct sta_info * sta,struct ieee80211_key * key,struct sk_buff * skb)4502 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4503 struct net_device *dev, struct sta_info *sta,
4504 struct ieee80211_key *key, struct sk_buff *skb)
4505 {
4506 struct ieee80211_tx_info *info;
4507 struct ieee80211_local *local = sdata->local;
4508 struct tid_ampdu_tx *tid_tx;
4509 u8 tid;
4510
4511 if (local->ops->wake_tx_queue) {
4512 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
4513 skb_set_queue_mapping(skb, queue);
4514 skb_get_hash(skb);
4515 }
4516
4517 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4518 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4519 goto out_free;
4520
4521 skb = skb_share_check(skb, GFP_ATOMIC);
4522 if (unlikely(!skb))
4523 return;
4524
4525 info = IEEE80211_SKB_CB(skb);
4526 memset(info, 0, sizeof(*info));
4527
4528 ieee80211_aggr_check(sdata, sta, skb);
4529
4530 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
4531 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
4532 if (tid_tx) {
4533 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
4534 /* fall back to non-offload slow path */
4535 __ieee80211_subif_start_xmit(skb, dev, 0,
4536 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4537 NULL);
4538 return;
4539 }
4540
4541 info->flags |= IEEE80211_TX_CTL_AMPDU;
4542 if (tid_tx->timeout)
4543 tid_tx->last_tx = jiffies;
4544 }
4545
4546 if (unlikely(skb->sk &&
4547 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
4548 info->ack_frame_id = ieee80211_store_ack_skb(local, skb,
4549 &info->flags, NULL);
4550
4551 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
4552
4553 dev_sw_netstats_tx_add(dev, 1, skb->len);
4554
4555 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
4556 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
4557
4558 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4559 sdata = container_of(sdata->bss,
4560 struct ieee80211_sub_if_data, u.ap);
4561
4562 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
4563 info->control.vif = &sdata->vif;
4564
4565 if (key)
4566 info->control.hw_key = &key->conf;
4567
4568 ieee80211_tx_8023(sdata, skb, sta, false);
4569
4570 return;
4571
4572 out_free:
4573 kfree_skb(skb);
4574 }
4575
ieee80211_subif_start_xmit_8023(struct sk_buff * skb,struct net_device * dev)4576 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4577 struct net_device *dev)
4578 {
4579 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4580 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4581 struct ieee80211_key *key;
4582 struct sta_info *sta;
4583
4584 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4585 kfree_skb(skb);
4586 return NETDEV_TX_OK;
4587 }
4588
4589 rcu_read_lock();
4590
4591 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4592 kfree_skb(skb);
4593 goto out;
4594 }
4595
4596 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
4597 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
4598 sdata->control_port_protocol == ehdr->h_proto))
4599 goto skip_offload;
4600
4601 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4602 if (!key)
4603 key = rcu_dereference(sdata->default_unicast_key);
4604
4605 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
4606 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
4607 goto skip_offload;
4608
4609 ieee80211_8023_xmit(sdata, dev, sta, key, skb);
4610 goto out;
4611
4612 skip_offload:
4613 ieee80211_subif_start_xmit(skb, dev);
4614 out:
4615 rcu_read_unlock();
4616
4617 return NETDEV_TX_OK;
4618 }
4619
4620 struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags)4621 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4622 struct sk_buff *skb, u32 info_flags)
4623 {
4624 struct ieee80211_hdr *hdr;
4625 struct ieee80211_tx_data tx = {
4626 .local = sdata->local,
4627 .sdata = sdata,
4628 };
4629 struct sta_info *sta;
4630
4631 rcu_read_lock();
4632
4633 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4634 kfree_skb(skb);
4635 skb = ERR_PTR(-EINVAL);
4636 goto out;
4637 }
4638
4639 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta,
4640 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
4641 if (IS_ERR(skb))
4642 goto out;
4643
4644 hdr = (void *)skb->data;
4645 tx.sta = sta_info_get(sdata, hdr->addr1);
4646 tx.skb = skb;
4647
4648 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4649 rcu_read_unlock();
4650 kfree_skb(skb);
4651 return ERR_PTR(-EINVAL);
4652 }
4653
4654 out:
4655 rcu_read_unlock();
4656 return skb;
4657 }
4658
4659 /*
4660 * ieee80211_clear_tx_pending may not be called in a context where
4661 * it is possible that it packets could come in again.
4662 */
ieee80211_clear_tx_pending(struct ieee80211_local * local)4663 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4664 {
4665 struct sk_buff *skb;
4666 int i;
4667
4668 for (i = 0; i < local->hw.queues; i++) {
4669 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4670 ieee80211_free_txskb(&local->hw, skb);
4671 }
4672 }
4673
4674 /*
4675 * Returns false if the frame couldn't be transmitted but was queued instead,
4676 * which in this case means re-queued -- take as an indication to stop sending
4677 * more pending frames.
4678 */
ieee80211_tx_pending_skb(struct ieee80211_local * local,struct sk_buff * skb)4679 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4680 struct sk_buff *skb)
4681 {
4682 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4683 struct ieee80211_sub_if_data *sdata;
4684 struct sta_info *sta;
4685 struct ieee80211_hdr *hdr;
4686 bool result;
4687 struct ieee80211_chanctx_conf *chanctx_conf;
4688
4689 sdata = vif_to_sdata(info->control.vif);
4690
4691 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
4692 /* update band only for non-MLD */
4693 if (!sdata->vif.valid_links) {
4694 chanctx_conf =
4695 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
4696 if (unlikely(!chanctx_conf)) {
4697 dev_kfree_skb(skb);
4698 return true;
4699 }
4700 info->band = chanctx_conf->def.chan->band;
4701 }
4702 result = ieee80211_tx(sdata, NULL, skb, true);
4703 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
4704 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4705 dev_kfree_skb(skb);
4706 return true;
4707 }
4708
4709 if (IS_ERR(sta) || (sta && !sta->uploaded))
4710 sta = NULL;
4711
4712 result = ieee80211_tx_8023(sdata, skb, sta, true);
4713 } else {
4714 struct sk_buff_head skbs;
4715
4716 __skb_queue_head_init(&skbs);
4717 __skb_queue_tail(&skbs, skb);
4718
4719 hdr = (struct ieee80211_hdr *)skb->data;
4720 sta = sta_info_get(sdata, hdr->addr1);
4721
4722 result = __ieee80211_tx(local, &skbs, sta, true);
4723 }
4724
4725 return result;
4726 }
4727
4728 /*
4729 * Transmit all pending packets. Called from tasklet.
4730 */
ieee80211_tx_pending(struct tasklet_struct * t)4731 void ieee80211_tx_pending(struct tasklet_struct *t)
4732 {
4733 struct ieee80211_local *local = from_tasklet(local, t,
4734 tx_pending_tasklet);
4735 unsigned long flags;
4736 int i;
4737 bool txok;
4738
4739 rcu_read_lock();
4740
4741 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4742 for (i = 0; i < local->hw.queues; i++) {
4743 /*
4744 * If queue is stopped by something other than due to pending
4745 * frames, or we have no pending frames, proceed to next queue.
4746 */
4747 if (local->queue_stop_reasons[i] ||
4748 skb_queue_empty(&local->pending[i]))
4749 continue;
4750
4751 while (!skb_queue_empty(&local->pending[i])) {
4752 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4753 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4754
4755 if (WARN_ON(!info->control.vif)) {
4756 ieee80211_free_txskb(&local->hw, skb);
4757 continue;
4758 }
4759
4760 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4761 flags);
4762
4763 txok = ieee80211_tx_pending_skb(local, skb);
4764 spin_lock_irqsave(&local->queue_stop_reason_lock,
4765 flags);
4766 if (!txok)
4767 break;
4768 }
4769
4770 if (skb_queue_empty(&local->pending[i]))
4771 ieee80211_propagate_queue_wake(local, i);
4772 }
4773 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4774
4775 rcu_read_unlock();
4776 }
4777
4778 /* functions for drivers to get certain frames */
4779
__ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ps_data * ps,struct sk_buff * skb,bool is_template)4780 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4781 struct ieee80211_link_data *link,
4782 struct ps_data *ps, struct sk_buff *skb,
4783 bool is_template)
4784 {
4785 u8 *pos, *tim;
4786 int aid0 = 0;
4787 int i, have_bits = 0, n1, n2;
4788 struct ieee80211_bss_conf *link_conf = link->conf;
4789
4790 /* Generate bitmap for TIM only if there are any STAs in power save
4791 * mode. */
4792 if (atomic_read(&ps->num_sta_ps) > 0)
4793 /* in the hope that this is faster than
4794 * checking byte-for-byte */
4795 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4796 IEEE80211_MAX_AID+1);
4797 if (!is_template) {
4798 if (ps->dtim_count == 0)
4799 ps->dtim_count = link_conf->dtim_period - 1;
4800 else
4801 ps->dtim_count--;
4802 }
4803
4804 tim = pos = skb_put(skb, 6);
4805 *pos++ = WLAN_EID_TIM;
4806 *pos++ = 4;
4807 *pos++ = ps->dtim_count;
4808 *pos++ = link_conf->dtim_period;
4809
4810 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4811 aid0 = 1;
4812
4813 ps->dtim_bc_mc = aid0 == 1;
4814
4815 if (have_bits) {
4816 /* Find largest even number N1 so that bits numbered 1 through
4817 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4818 * (N2 + 1) x 8 through 2007 are 0. */
4819 n1 = 0;
4820 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4821 if (ps->tim[i]) {
4822 n1 = i & 0xfe;
4823 break;
4824 }
4825 }
4826 n2 = n1;
4827 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4828 if (ps->tim[i]) {
4829 n2 = i;
4830 break;
4831 }
4832 }
4833
4834 /* Bitmap control */
4835 *pos++ = n1 | aid0;
4836 /* Part Virt Bitmap */
4837 skb_put(skb, n2 - n1);
4838 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4839
4840 tim[1] = n2 - n1 + 4;
4841 } else {
4842 *pos++ = aid0; /* Bitmap control */
4843 *pos++ = 0; /* Part Virt Bitmap */
4844 }
4845 }
4846
ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ps_data * ps,struct sk_buff * skb,bool is_template)4847 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4848 struct ieee80211_link_data *link,
4849 struct ps_data *ps, struct sk_buff *skb,
4850 bool is_template)
4851 {
4852 struct ieee80211_local *local = sdata->local;
4853
4854 /*
4855 * Not very nice, but we want to allow the driver to call
4856 * ieee80211_beacon_get() as a response to the set_tim()
4857 * callback. That, however, is already invoked under the
4858 * sta_lock to guarantee consistent and race-free update
4859 * of the tim bitmap in mac80211 and the driver.
4860 */
4861 if (local->tim_in_locked_section) {
4862 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
4863 } else {
4864 spin_lock_bh(&local->tim_lock);
4865 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
4866 spin_unlock_bh(&local->tim_lock);
4867 }
4868
4869 return 0;
4870 }
4871
ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data * sdata,struct beacon_data * beacon,struct ieee80211_link_data * link)4872 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
4873 struct beacon_data *beacon,
4874 struct ieee80211_link_data *link)
4875 {
4876 u8 *beacon_data, count, max_count = 1;
4877 struct probe_resp *resp;
4878 size_t beacon_data_len;
4879 u16 *bcn_offsets;
4880 int i;
4881
4882 switch (sdata->vif.type) {
4883 case NL80211_IFTYPE_AP:
4884 beacon_data = beacon->tail;
4885 beacon_data_len = beacon->tail_len;
4886 break;
4887 case NL80211_IFTYPE_ADHOC:
4888 beacon_data = beacon->head;
4889 beacon_data_len = beacon->head_len;
4890 break;
4891 case NL80211_IFTYPE_MESH_POINT:
4892 beacon_data = beacon->head;
4893 beacon_data_len = beacon->head_len;
4894 break;
4895 default:
4896 return;
4897 }
4898
4899 resp = rcu_dereference(link->u.ap.probe_resp);
4900
4901 bcn_offsets = beacon->cntdwn_counter_offsets;
4902 count = beacon->cntdwn_current_counter;
4903 if (link->conf->csa_active)
4904 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
4905
4906 for (i = 0; i < max_count; ++i) {
4907 if (bcn_offsets[i]) {
4908 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len))
4909 return;
4910 beacon_data[bcn_offsets[i]] = count;
4911 }
4912
4913 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
4914 u16 *resp_offsets = resp->cntdwn_counter_offsets;
4915
4916 resp->data[resp_offsets[i]] = count;
4917 }
4918 }
4919 }
4920
__ieee80211_beacon_update_cntdwn(struct beacon_data * beacon)4921 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon)
4922 {
4923 beacon->cntdwn_current_counter--;
4924
4925 /* the counter should never reach 0 */
4926 WARN_ON_ONCE(!beacon->cntdwn_current_counter);
4927
4928 return beacon->cntdwn_current_counter;
4929 }
4930
ieee80211_beacon_update_cntdwn(struct ieee80211_vif * vif)4931 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif)
4932 {
4933 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4934 struct beacon_data *beacon = NULL;
4935 u8 count = 0;
4936
4937 rcu_read_lock();
4938
4939 if (sdata->vif.type == NL80211_IFTYPE_AP)
4940 beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
4941 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4942 beacon = rcu_dereference(sdata->u.ibss.presp);
4943 else if (ieee80211_vif_is_mesh(&sdata->vif))
4944 beacon = rcu_dereference(sdata->u.mesh.beacon);
4945
4946 if (!beacon)
4947 goto unlock;
4948
4949 count = __ieee80211_beacon_update_cntdwn(beacon);
4950
4951 unlock:
4952 rcu_read_unlock();
4953 return count;
4954 }
4955 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
4956
ieee80211_beacon_set_cntdwn(struct ieee80211_vif * vif,u8 counter)4957 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
4958 {
4959 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4960 struct beacon_data *beacon = NULL;
4961
4962 rcu_read_lock();
4963
4964 if (sdata->vif.type == NL80211_IFTYPE_AP)
4965 beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
4966 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4967 beacon = rcu_dereference(sdata->u.ibss.presp);
4968 else if (ieee80211_vif_is_mesh(&sdata->vif))
4969 beacon = rcu_dereference(sdata->u.mesh.beacon);
4970
4971 if (!beacon)
4972 goto unlock;
4973
4974 if (counter < beacon->cntdwn_current_counter)
4975 beacon->cntdwn_current_counter = counter;
4976
4977 unlock:
4978 rcu_read_unlock();
4979 }
4980 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
4981
ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif * vif)4982 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif)
4983 {
4984 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4985 struct beacon_data *beacon = NULL;
4986 u8 *beacon_data;
4987 size_t beacon_data_len;
4988 int ret = false;
4989
4990 if (!ieee80211_sdata_running(sdata))
4991 return false;
4992
4993 rcu_read_lock();
4994 if (vif->type == NL80211_IFTYPE_AP) {
4995 beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
4996 if (WARN_ON(!beacon || !beacon->tail))
4997 goto out;
4998 beacon_data = beacon->tail;
4999 beacon_data_len = beacon->tail_len;
5000 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
5001 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5002
5003 beacon = rcu_dereference(ifibss->presp);
5004 if (!beacon)
5005 goto out;
5006
5007 beacon_data = beacon->head;
5008 beacon_data_len = beacon->head_len;
5009 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
5010 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5011
5012 beacon = rcu_dereference(ifmsh->beacon);
5013 if (!beacon)
5014 goto out;
5015
5016 beacon_data = beacon->head;
5017 beacon_data_len = beacon->head_len;
5018 } else {
5019 WARN_ON(1);
5020 goto out;
5021 }
5022
5023 if (!beacon->cntdwn_counter_offsets[0])
5024 goto out;
5025
5026 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
5027 goto out;
5028
5029 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
5030 ret = true;
5031
5032 out:
5033 rcu_read_unlock();
5034
5035 return ret;
5036 }
5037 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
5038
ieee80211_beacon_protect(struct sk_buff * skb,struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link)5039 static int ieee80211_beacon_protect(struct sk_buff *skb,
5040 struct ieee80211_local *local,
5041 struct ieee80211_sub_if_data *sdata,
5042 struct ieee80211_link_data *link)
5043 {
5044 ieee80211_tx_result res;
5045 struct ieee80211_tx_data tx;
5046 struct sk_buff *check_skb;
5047
5048 memset(&tx, 0, sizeof(tx));
5049 tx.key = rcu_dereference(link->default_beacon_key);
5050 if (!tx.key)
5051 return 0;
5052 tx.local = local;
5053 tx.sdata = sdata;
5054 __skb_queue_head_init(&tx.skbs);
5055 __skb_queue_tail(&tx.skbs, skb);
5056 res = ieee80211_tx_h_encrypt(&tx);
5057 check_skb = __skb_dequeue(&tx.skbs);
5058 /* we may crash after this, but it'd be a bug in crypto */
5059 WARN_ON(check_skb != skb);
5060 if (WARN_ON_ONCE(res != TX_CONTINUE))
5061 return -EINVAL;
5062
5063 return 0;
5064 }
5065
5066 static void
ieee80211_beacon_get_finish(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,struct beacon_data * beacon,struct sk_buff * skb,struct ieee80211_chanctx_conf * chanctx_conf,u16 csa_off_base)5067 ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
5068 struct ieee80211_vif *vif,
5069 struct ieee80211_link_data *link,
5070 struct ieee80211_mutable_offsets *offs,
5071 struct beacon_data *beacon,
5072 struct sk_buff *skb,
5073 struct ieee80211_chanctx_conf *chanctx_conf,
5074 u16 csa_off_base)
5075 {
5076 struct ieee80211_local *local = hw_to_local(hw);
5077 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5078 struct ieee80211_tx_info *info;
5079 enum nl80211_band band;
5080 struct ieee80211_tx_rate_control txrc;
5081
5082 /* CSA offsets */
5083 if (offs && beacon) {
5084 u16 i;
5085
5086 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
5087 u16 csa_off = beacon->cntdwn_counter_offsets[i];
5088
5089 if (!csa_off)
5090 continue;
5091
5092 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
5093 }
5094 }
5095
5096 band = chanctx_conf->def.chan->band;
5097 info = IEEE80211_SKB_CB(skb);
5098 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5099 info->flags |= IEEE80211_TX_CTL_NO_ACK;
5100 info->band = band;
5101
5102 memset(&txrc, 0, sizeof(txrc));
5103 txrc.hw = hw;
5104 txrc.sband = local->hw.wiphy->bands[band];
5105 txrc.bss_conf = link->conf;
5106 txrc.skb = skb;
5107 txrc.reported_rate.idx = -1;
5108 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
5109 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
5110 else
5111 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
5112 txrc.bss = true;
5113 rate_control_get_rate(sdata, NULL, &txrc);
5114
5115 info->control.vif = vif;
5116 info->control.flags |= u32_encode_bits(link->link_id,
5117 IEEE80211_TX_CTRL_MLO_LINK);
5118 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
5119 IEEE80211_TX_CTL_ASSIGN_SEQ |
5120 IEEE80211_TX_CTL_FIRST_FRAGMENT;
5121 }
5122
5123 static void
ieee80211_beacon_add_mbssid(struct sk_buff * skb,struct beacon_data * beacon)5124 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon)
5125 {
5126 int i;
5127
5128 if (!beacon->mbssid_ies)
5129 return;
5130
5131 for (i = 0; i < beacon->mbssid_ies->cnt; i++)
5132 skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5133 beacon->mbssid_ies->elem[i].len);
5134 }
5135
5136 static struct sk_buff *
ieee80211_beacon_get_ap(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,bool is_template,struct beacon_data * beacon,struct ieee80211_chanctx_conf * chanctx_conf)5137 ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
5138 struct ieee80211_vif *vif,
5139 struct ieee80211_link_data *link,
5140 struct ieee80211_mutable_offsets *offs,
5141 bool is_template,
5142 struct beacon_data *beacon,
5143 struct ieee80211_chanctx_conf *chanctx_conf)
5144 {
5145 struct ieee80211_local *local = hw_to_local(hw);
5146 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5147 struct ieee80211_if_ap *ap = &sdata->u.ap;
5148 struct sk_buff *skb = NULL;
5149 u16 csa_off_base = 0;
5150 int mbssid_len;
5151
5152 if (beacon->cntdwn_counter_offsets[0]) {
5153 if (!is_template)
5154 ieee80211_beacon_update_cntdwn(vif);
5155
5156 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5157 }
5158
5159 /* headroom, head length,
5160 * tail length, maximum TIM length and multiple BSSID length
5161 */
5162 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies);
5163 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5164 beacon->tail_len + 256 +
5165 local->hw.extra_beacon_tailroom + mbssid_len);
5166 if (!skb)
5167 return NULL;
5168
5169 skb_reserve(skb, local->tx_headroom);
5170 skb_put_data(skb, beacon->head, beacon->head_len);
5171
5172 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
5173
5174 if (offs) {
5175 offs->tim_offset = beacon->head_len;
5176 offs->tim_length = skb->len - beacon->head_len;
5177 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
5178
5179 if (mbssid_len) {
5180 ieee80211_beacon_add_mbssid(skb, beacon);
5181 offs->mbssid_off = skb->len - mbssid_len;
5182 }
5183
5184 /* for AP the csa offsets are from tail */
5185 csa_off_base = skb->len;
5186 }
5187
5188 if (beacon->tail)
5189 skb_put_data(skb, beacon->tail, beacon->tail_len);
5190
5191 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0)
5192 return NULL;
5193
5194 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5195 chanctx_conf, csa_off_base);
5196 return skb;
5197 }
5198
5199 static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,bool is_template,unsigned int link_id)5200 __ieee80211_beacon_get(struct ieee80211_hw *hw,
5201 struct ieee80211_vif *vif,
5202 struct ieee80211_mutable_offsets *offs,
5203 bool is_template,
5204 unsigned int link_id)
5205 {
5206 struct ieee80211_local *local = hw_to_local(hw);
5207 struct beacon_data *beacon = NULL;
5208 struct sk_buff *skb = NULL;
5209 struct ieee80211_sub_if_data *sdata = NULL;
5210 struct ieee80211_chanctx_conf *chanctx_conf;
5211 struct ieee80211_link_data *link;
5212
5213 rcu_read_lock();
5214
5215 sdata = vif_to_sdata(vif);
5216 link = rcu_dereference(sdata->link[link_id]);
5217 if (!link)
5218 goto out;
5219 chanctx_conf =
5220 rcu_dereference(link->conf->chanctx_conf);
5221
5222 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
5223 goto out;
5224
5225 if (offs)
5226 memset(offs, 0, sizeof(*offs));
5227
5228 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5229 beacon = rcu_dereference(link->u.ap.beacon);
5230 if (!beacon)
5231 goto out;
5232
5233 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template,
5234 beacon, chanctx_conf);
5235 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
5236 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5237 struct ieee80211_hdr *hdr;
5238
5239 beacon = rcu_dereference(ifibss->presp);
5240 if (!beacon)
5241 goto out;
5242
5243 if (beacon->cntdwn_counter_offsets[0]) {
5244 if (!is_template)
5245 __ieee80211_beacon_update_cntdwn(beacon);
5246
5247 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5248 }
5249
5250 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5251 local->hw.extra_beacon_tailroom);
5252 if (!skb)
5253 goto out;
5254 skb_reserve(skb, local->tx_headroom);
5255 skb_put_data(skb, beacon->head, beacon->head_len);
5256
5257 hdr = (struct ieee80211_hdr *) skb->data;
5258 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5259 IEEE80211_STYPE_BEACON);
5260
5261 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5262 chanctx_conf, 0);
5263 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5264 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5265
5266 beacon = rcu_dereference(ifmsh->beacon);
5267 if (!beacon)
5268 goto out;
5269
5270 if (beacon->cntdwn_counter_offsets[0]) {
5271 if (!is_template)
5272 /* TODO: For mesh csa_counter is in TU, so
5273 * decrementing it by one isn't correct, but
5274 * for now we leave it consistent with overall
5275 * mac80211's behavior.
5276 */
5277 __ieee80211_beacon_update_cntdwn(beacon);
5278
5279 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5280 }
5281
5282 if (ifmsh->sync_ops)
5283 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
5284
5285 skb = dev_alloc_skb(local->tx_headroom +
5286 beacon->head_len +
5287 256 + /* TIM IE */
5288 beacon->tail_len +
5289 local->hw.extra_beacon_tailroom);
5290 if (!skb)
5291 goto out;
5292 skb_reserve(skb, local->tx_headroom);
5293 skb_put_data(skb, beacon->head, beacon->head_len);
5294 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb,
5295 is_template);
5296
5297 if (offs) {
5298 offs->tim_offset = beacon->head_len;
5299 offs->tim_length = skb->len - beacon->head_len;
5300 }
5301
5302 skb_put_data(skb, beacon->tail, beacon->tail_len);
5303 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5304 chanctx_conf, 0);
5305 } else {
5306 WARN_ON(1);
5307 goto out;
5308 }
5309
5310 out:
5311 rcu_read_unlock();
5312 return skb;
5313
5314 }
5315
5316 struct sk_buff *
ieee80211_beacon_get_template(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,unsigned int link_id)5317 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
5318 struct ieee80211_vif *vif,
5319 struct ieee80211_mutable_offsets *offs,
5320 unsigned int link_id)
5321 {
5322 return __ieee80211_beacon_get(hw, vif, offs, true, link_id);
5323 }
5324 EXPORT_SYMBOL(ieee80211_beacon_get_template);
5325
ieee80211_beacon_get_tim(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 * tim_offset,u16 * tim_length,unsigned int link_id)5326 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
5327 struct ieee80211_vif *vif,
5328 u16 *tim_offset, u16 *tim_length,
5329 unsigned int link_id)
5330 {
5331 struct ieee80211_mutable_offsets offs = {};
5332 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false,
5333 link_id);
5334 struct sk_buff *copy;
5335 int shift;
5336
5337 if (!bcn)
5338 return bcn;
5339
5340 if (tim_offset)
5341 *tim_offset = offs.tim_offset;
5342
5343 if (tim_length)
5344 *tim_length = offs.tim_length;
5345
5346 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
5347 !hw_to_local(hw)->monitors)
5348 return bcn;
5349
5350 /* send a copy to monitor interfaces */
5351 copy = skb_copy(bcn, GFP_ATOMIC);
5352 if (!copy)
5353 return bcn;
5354
5355 shift = ieee80211_vif_get_shift(vif);
5356 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL);
5357
5358 return bcn;
5359 }
5360 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
5361
ieee80211_proberesp_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5362 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
5363 struct ieee80211_vif *vif)
5364 {
5365 struct sk_buff *skb = NULL;
5366 struct probe_resp *presp = NULL;
5367 struct ieee80211_hdr *hdr;
5368 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5369
5370 if (sdata->vif.type != NL80211_IFTYPE_AP)
5371 return NULL;
5372
5373 rcu_read_lock();
5374 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp);
5375 if (!presp)
5376 goto out;
5377
5378 skb = dev_alloc_skb(presp->len);
5379 if (!skb)
5380 goto out;
5381
5382 skb_put_data(skb, presp->data, presp->len);
5383
5384 hdr = (struct ieee80211_hdr *) skb->data;
5385 memset(hdr->addr1, 0, sizeof(hdr->addr1));
5386
5387 out:
5388 rcu_read_unlock();
5389 return skb;
5390 }
5391 EXPORT_SYMBOL(ieee80211_proberesp_get);
5392
ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5393 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
5394 struct ieee80211_vif *vif)
5395 {
5396 struct sk_buff *skb = NULL;
5397 struct fils_discovery_data *tmpl = NULL;
5398 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5399
5400 if (sdata->vif.type != NL80211_IFTYPE_AP)
5401 return NULL;
5402
5403 rcu_read_lock();
5404 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery);
5405 if (!tmpl) {
5406 rcu_read_unlock();
5407 return NULL;
5408 }
5409
5410 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5411 if (skb) {
5412 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5413 skb_put_data(skb, tmpl->data, tmpl->len);
5414 }
5415
5416 rcu_read_unlock();
5417 return skb;
5418 }
5419 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
5420
5421 struct sk_buff *
ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5422 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
5423 struct ieee80211_vif *vif)
5424 {
5425 struct sk_buff *skb = NULL;
5426 struct unsol_bcast_probe_resp_data *tmpl = NULL;
5427 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5428
5429 if (sdata->vif.type != NL80211_IFTYPE_AP)
5430 return NULL;
5431
5432 rcu_read_lock();
5433 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp);
5434 if (!tmpl) {
5435 rcu_read_unlock();
5436 return NULL;
5437 }
5438
5439 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5440 if (skb) {
5441 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5442 skb_put_data(skb, tmpl->data, tmpl->len);
5443 }
5444
5445 rcu_read_unlock();
5446 return skb;
5447 }
5448 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
5449
ieee80211_pspoll_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5450 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
5451 struct ieee80211_vif *vif)
5452 {
5453 struct ieee80211_sub_if_data *sdata;
5454 struct ieee80211_pspoll *pspoll;
5455 struct ieee80211_local *local;
5456 struct sk_buff *skb;
5457
5458 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5459 return NULL;
5460
5461 sdata = vif_to_sdata(vif);
5462 local = sdata->local;
5463
5464 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
5465 if (!skb)
5466 return NULL;
5467
5468 skb_reserve(skb, local->hw.extra_tx_headroom);
5469
5470 pspoll = skb_put_zero(skb, sizeof(*pspoll));
5471 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
5472 IEEE80211_STYPE_PSPOLL);
5473 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid);
5474
5475 /* aid in PS-Poll has its two MSBs each set to 1 */
5476 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
5477
5478 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
5479 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
5480
5481 return skb;
5482 }
5483 EXPORT_SYMBOL(ieee80211_pspoll_get);
5484
ieee80211_nullfunc_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,int link_id,bool qos_ok)5485 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
5486 struct ieee80211_vif *vif,
5487 int link_id, bool qos_ok)
5488 {
5489 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5490 struct ieee80211_local *local = sdata->local;
5491 struct ieee80211_link_data *link = NULL;
5492 struct ieee80211_hdr_3addr *nullfunc;
5493 struct sk_buff *skb;
5494 bool qos = false;
5495
5496 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5497 return NULL;
5498
5499 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5500 sizeof(*nullfunc) + 2);
5501 if (!skb)
5502 return NULL;
5503
5504 rcu_read_lock();
5505 if (qos_ok) {
5506 struct sta_info *sta;
5507
5508 sta = sta_info_get(sdata, vif->cfg.ap_addr);
5509 qos = sta && sta->sta.wme;
5510 }
5511
5512 if (link_id >= 0) {
5513 link = rcu_dereference(sdata->link[link_id]);
5514 if (WARN_ON_ONCE(!link)) {
5515 rcu_read_unlock();
5516 kfree_skb(skb);
5517 return NULL;
5518 }
5519 }
5520
5521 skb_reserve(skb, local->hw.extra_tx_headroom);
5522
5523 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
5524 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
5525 IEEE80211_STYPE_NULLFUNC |
5526 IEEE80211_FCTL_TODS);
5527 if (qos) {
5528 __le16 qoshdr = cpu_to_le16(7);
5529
5530 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
5531 IEEE80211_STYPE_NULLFUNC) !=
5532 IEEE80211_STYPE_QOS_NULLFUNC);
5533 nullfunc->frame_control |=
5534 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
5535 skb->priority = 7;
5536 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
5537 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
5538 }
5539
5540 if (link) {
5541 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN);
5542 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN);
5543 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN);
5544 } else {
5545 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN);
5546 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
5547 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN);
5548 }
5549 rcu_read_unlock();
5550
5551 return skb;
5552 }
5553 EXPORT_SYMBOL(ieee80211_nullfunc_get);
5554
ieee80211_probereq_get(struct ieee80211_hw * hw,const u8 * src_addr,const u8 * ssid,size_t ssid_len,size_t tailroom)5555 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
5556 const u8 *src_addr,
5557 const u8 *ssid, size_t ssid_len,
5558 size_t tailroom)
5559 {
5560 struct ieee80211_local *local = hw_to_local(hw);
5561 struct ieee80211_hdr_3addr *hdr;
5562 struct sk_buff *skb;
5563 size_t ie_ssid_len;
5564 u8 *pos;
5565
5566 ie_ssid_len = 2 + ssid_len;
5567
5568 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
5569 ie_ssid_len + tailroom);
5570 if (!skb)
5571 return NULL;
5572
5573 skb_reserve(skb, local->hw.extra_tx_headroom);
5574
5575 hdr = skb_put_zero(skb, sizeof(*hdr));
5576 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5577 IEEE80211_STYPE_PROBE_REQ);
5578 eth_broadcast_addr(hdr->addr1);
5579 memcpy(hdr->addr2, src_addr, ETH_ALEN);
5580 eth_broadcast_addr(hdr->addr3);
5581
5582 pos = skb_put(skb, ie_ssid_len);
5583 *pos++ = WLAN_EID_SSID;
5584 *pos++ = ssid_len;
5585 if (ssid_len)
5586 memcpy(pos, ssid, ssid_len);
5587 pos += ssid_len;
5588
5589 return skb;
5590 }
5591 EXPORT_SYMBOL(ieee80211_probereq_get);
5592
ieee80211_rts_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_rts * rts)5593 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5594 const void *frame, size_t frame_len,
5595 const struct ieee80211_tx_info *frame_txctl,
5596 struct ieee80211_rts *rts)
5597 {
5598 const struct ieee80211_hdr *hdr = frame;
5599
5600 rts->frame_control =
5601 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
5602 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
5603 frame_txctl);
5604 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
5605 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
5606 }
5607 EXPORT_SYMBOL(ieee80211_rts_get);
5608
ieee80211_ctstoself_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_cts * cts)5609 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5610 const void *frame, size_t frame_len,
5611 const struct ieee80211_tx_info *frame_txctl,
5612 struct ieee80211_cts *cts)
5613 {
5614 const struct ieee80211_hdr *hdr = frame;
5615
5616 cts->frame_control =
5617 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
5618 cts->duration = ieee80211_ctstoself_duration(hw, vif,
5619 frame_len, frame_txctl);
5620 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
5621 }
5622 EXPORT_SYMBOL(ieee80211_ctstoself_get);
5623
5624 struct sk_buff *
ieee80211_get_buffered_bc(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5625 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
5626 struct ieee80211_vif *vif)
5627 {
5628 struct ieee80211_local *local = hw_to_local(hw);
5629 struct sk_buff *skb = NULL;
5630 struct ieee80211_tx_data tx;
5631 struct ieee80211_sub_if_data *sdata;
5632 struct ps_data *ps;
5633 struct ieee80211_tx_info *info;
5634 struct ieee80211_chanctx_conf *chanctx_conf;
5635
5636 sdata = vif_to_sdata(vif);
5637
5638 rcu_read_lock();
5639 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
5640
5641 if (!chanctx_conf)
5642 goto out;
5643
5644 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5645 struct beacon_data *beacon =
5646 rcu_dereference(sdata->deflink.u.ap.beacon);
5647
5648 if (!beacon || !beacon->head)
5649 goto out;
5650
5651 ps = &sdata->u.ap.ps;
5652 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5653 ps = &sdata->u.mesh.ps;
5654 } else {
5655 goto out;
5656 }
5657
5658 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
5659 goto out; /* send buffered bc/mc only after DTIM beacon */
5660
5661 while (1) {
5662 skb = skb_dequeue(&ps->bc_buf);
5663 if (!skb)
5664 goto out;
5665 local->total_ps_buffered--;
5666
5667 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
5668 struct ieee80211_hdr *hdr =
5669 (struct ieee80211_hdr *) skb->data;
5670 /* more buffered multicast/broadcast frames ==> set
5671 * MoreData flag in IEEE 802.11 header to inform PS
5672 * STAs */
5673 hdr->frame_control |=
5674 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
5675 }
5676
5677 if (sdata->vif.type == NL80211_IFTYPE_AP)
5678 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
5679 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
5680 break;
5681 ieee80211_free_txskb(hw, skb);
5682 }
5683
5684 info = IEEE80211_SKB_CB(skb);
5685
5686 tx.flags |= IEEE80211_TX_PS_BUFFERED;
5687 info->band = chanctx_conf->def.chan->band;
5688
5689 if (invoke_tx_handlers(&tx))
5690 skb = NULL;
5691 out:
5692 rcu_read_unlock();
5693
5694 return skb;
5695 }
5696 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
5697
ieee80211_reserve_tid(struct ieee80211_sta * pubsta,u8 tid)5698 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5699 {
5700 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5701 struct ieee80211_sub_if_data *sdata = sta->sdata;
5702 struct ieee80211_local *local = sdata->local;
5703 int ret;
5704 u32 queues;
5705
5706 lockdep_assert_held(&local->sta_mtx);
5707
5708 /* only some cases are supported right now */
5709 switch (sdata->vif.type) {
5710 case NL80211_IFTYPE_STATION:
5711 case NL80211_IFTYPE_AP:
5712 case NL80211_IFTYPE_AP_VLAN:
5713 break;
5714 default:
5715 WARN_ON(1);
5716 return -EINVAL;
5717 }
5718
5719 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
5720 return -EINVAL;
5721
5722 if (sta->reserved_tid == tid) {
5723 ret = 0;
5724 goto out;
5725 }
5726
5727 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
5728 sdata_err(sdata, "TID reservation already active\n");
5729 ret = -EALREADY;
5730 goto out;
5731 }
5732
5733 ieee80211_stop_vif_queues(sdata->local, sdata,
5734 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5735
5736 synchronize_net();
5737
5738 /* Tear down BA sessions so we stop aggregating on this TID */
5739 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
5740 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
5741 __ieee80211_stop_tx_ba_session(sta, tid,
5742 AGG_STOP_LOCAL_REQUEST);
5743 }
5744
5745 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
5746 __ieee80211_flush_queues(local, sdata, queues, false);
5747
5748 sta->reserved_tid = tid;
5749
5750 ieee80211_wake_vif_queues(local, sdata,
5751 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5752
5753 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
5754 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
5755
5756 ret = 0;
5757 out:
5758 return ret;
5759 }
5760 EXPORT_SYMBOL(ieee80211_reserve_tid);
5761
ieee80211_unreserve_tid(struct ieee80211_sta * pubsta,u8 tid)5762 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5763 {
5764 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5765 struct ieee80211_sub_if_data *sdata = sta->sdata;
5766
5767 lockdep_assert_held(&sdata->local->sta_mtx);
5768
5769 /* only some cases are supported right now */
5770 switch (sdata->vif.type) {
5771 case NL80211_IFTYPE_STATION:
5772 case NL80211_IFTYPE_AP:
5773 case NL80211_IFTYPE_AP_VLAN:
5774 break;
5775 default:
5776 WARN_ON(1);
5777 return;
5778 }
5779
5780 if (tid != sta->reserved_tid) {
5781 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
5782 return;
5783 }
5784
5785 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
5786 }
5787 EXPORT_SYMBOL(ieee80211_unreserve_tid);
5788
__ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,int link_id,enum nl80211_band band)5789 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
5790 struct sk_buff *skb, int tid, int link_id,
5791 enum nl80211_band band)
5792 {
5793 const struct ieee80211_hdr *hdr = (void *)skb->data;
5794 int ac = ieee80211_ac_from_tid(tid);
5795 unsigned int link;
5796
5797 skb_reset_mac_header(skb);
5798 skb_set_queue_mapping(skb, ac);
5799 skb->priority = tid;
5800
5801 skb->dev = sdata->dev;
5802
5803 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS);
5804 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK,
5805 IEEE80211_LINK_UNSPECIFIED));
5806
5807 if (!sdata->vif.valid_links) {
5808 link = 0;
5809 } else if (link_id >= 0) {
5810 link = link_id;
5811 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) {
5812 /* address from the MLD */
5813 link = IEEE80211_LINK_UNSPECIFIED;
5814 } else {
5815 /* otherwise must be addressed from a link */
5816 rcu_read_lock();
5817 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) {
5818 struct ieee80211_bss_conf *link_conf;
5819
5820 link_conf = rcu_dereference(sdata->vif.link_conf[link]);
5821 if (!link_conf)
5822 continue;
5823 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0)
5824 break;
5825 }
5826 rcu_read_unlock();
5827
5828 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf)))
5829 link = ffs(sdata->vif.valid_links) - 1;
5830 }
5831
5832 IEEE80211_SKB_CB(skb)->control.flags |=
5833 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK);
5834
5835 /*
5836 * The other path calling ieee80211_xmit is from the tasklet,
5837 * and while we can handle concurrent transmissions locking
5838 * requirements are that we do not come into tx with bhs on.
5839 */
5840 local_bh_disable();
5841 IEEE80211_SKB_CB(skb)->band = band;
5842 ieee80211_xmit(sdata, NULL, skb);
5843 local_bh_enable();
5844 }
5845
ieee80211_tx_skb_tid(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,int link_id)5846 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
5847 struct sk_buff *skb, int tid, int link_id)
5848 {
5849 struct ieee80211_chanctx_conf *chanctx_conf;
5850 enum nl80211_band band;
5851
5852 rcu_read_lock();
5853 if (!sdata->vif.valid_links) {
5854 WARN_ON(link_id >= 0);
5855 chanctx_conf =
5856 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
5857 if (WARN_ON(!chanctx_conf)) {
5858 rcu_read_unlock();
5859 kfree_skb(skb);
5860 return;
5861 }
5862 band = chanctx_conf->def.chan->band;
5863 } else {
5864 WARN_ON(link_id >= 0 &&
5865 !(sdata->vif.valid_links & BIT(link_id)));
5866 /* MLD transmissions must not rely on the band */
5867 band = 0;
5868 }
5869
5870 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band);
5871 rcu_read_unlock();
5872 }
5873
ieee80211_tx_control_port(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len,const u8 * dest,__be16 proto,bool unencrypted,int link_id,u64 * cookie)5874 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
5875 const u8 *buf, size_t len,
5876 const u8 *dest, __be16 proto, bool unencrypted,
5877 int link_id, u64 *cookie)
5878 {
5879 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5880 struct ieee80211_local *local = sdata->local;
5881 struct sta_info *sta;
5882 struct sk_buff *skb;
5883 struct ethhdr *ehdr;
5884 u32 ctrl_flags = 0;
5885 u32 flags = 0;
5886 int err;
5887
5888 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
5889 * or Pre-Authentication
5890 */
5891 if (proto != sdata->control_port_protocol &&
5892 proto != cpu_to_be16(ETH_P_PREAUTH))
5893 return -EINVAL;
5894
5895 if (proto == sdata->control_port_protocol)
5896 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
5897 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
5898
5899 if (unencrypted)
5900 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5901
5902 if (cookie)
5903 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
5904
5905 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
5906
5907 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5908 sizeof(struct ethhdr) + len);
5909 if (!skb)
5910 return -ENOMEM;
5911
5912 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
5913
5914 skb_put_data(skb, buf, len);
5915
5916 ehdr = skb_push(skb, sizeof(struct ethhdr));
5917 memcpy(ehdr->h_dest, dest, ETH_ALEN);
5918
5919 /* we may override the SA for MLO STA later */
5920 if (link_id < 0) {
5921 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
5922 IEEE80211_TX_CTRL_MLO_LINK);
5923 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
5924 } else {
5925 struct ieee80211_bss_conf *link_conf;
5926
5927 ctrl_flags |= u32_encode_bits(link_id,
5928 IEEE80211_TX_CTRL_MLO_LINK);
5929
5930 rcu_read_lock();
5931 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
5932 if (!link_conf) {
5933 dev_kfree_skb(skb);
5934 rcu_read_unlock();
5935 return -ENOLINK;
5936 }
5937 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN);
5938 rcu_read_unlock();
5939 }
5940
5941 ehdr->h_proto = proto;
5942
5943 skb->dev = dev;
5944 skb->protocol = proto;
5945 skb_reset_network_header(skb);
5946 skb_reset_mac_header(skb);
5947
5948 if (local->hw.queues < IEEE80211_NUM_ACS)
5949 goto start_xmit;
5950
5951 /* update QoS header to prioritize control port frames if possible,
5952 * priorization also happens for control port frames send over
5953 * AF_PACKET
5954 */
5955 rcu_read_lock();
5956 err = ieee80211_lookup_ra_sta(sdata, skb, &sta);
5957 if (err) {
5958 dev_kfree_skb(skb);
5959 rcu_read_unlock();
5960 return err;
5961 }
5962
5963 if (!IS_ERR(sta)) {
5964 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
5965
5966 skb_set_queue_mapping(skb, queue);
5967 skb_get_hash(skb);
5968
5969 /*
5970 * for MLO STA, the SA should be the AP MLD address, but
5971 * the link ID has been selected already
5972 */
5973 if (sta && sta->sta.mlo)
5974 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
5975 }
5976 rcu_read_unlock();
5977
5978 start_xmit:
5979 /* mutex lock is only needed for incrementing the cookie counter */
5980 mutex_lock(&local->mtx);
5981
5982 local_bh_disable();
5983 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie);
5984 local_bh_enable();
5985
5986 mutex_unlock(&local->mtx);
5987
5988 return 0;
5989 }
5990
ieee80211_probe_mesh_link(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len)5991 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
5992 const u8 *buf, size_t len)
5993 {
5994 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5995 struct ieee80211_local *local = sdata->local;
5996 struct sk_buff *skb;
5997
5998 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
5999 30 + /* header size */
6000 18); /* 11s header size */
6001 if (!skb)
6002 return -ENOMEM;
6003
6004 skb_reserve(skb, local->hw.extra_tx_headroom);
6005 skb_put_data(skb, buf, len);
6006
6007 skb->dev = dev;
6008 skb->protocol = htons(ETH_P_802_3);
6009 skb_reset_network_header(skb);
6010 skb_reset_mac_header(skb);
6011
6012 local_bh_disable();
6013 __ieee80211_subif_start_xmit(skb, skb->dev, 0,
6014 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
6015 NULL);
6016 local_bh_enable();
6017
6018 return 0;
6019 }
6020